Maelstrom Portal

Maelstrom Portal

Set:	One Night in Karazhan
Type:	Spell
Class:	Shaman
Rarity:	Rare
Cost:	2
Abilities:	Deal damage, Summon
Tags:	Area of effect, Cost-related, Random
Artist:	Daria Tuzova

Deal 1 damage to all enemy minions. Summon a random 1-Cost minion.

They bill this as a popular resort attraction, but they try and get your money up front.

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Maelstrom Portal is a rare shaman spell card, from the One Night in Karazhan set.

How to get

Two copies of regular Maelstrom Portal are obtained by completing the shaman Class Challenge in One Night in Karazhan, unlocked upon completing first wing, The Parlor.

As a Wild format card, both regular and golden versions of Maelstrom Portal can also be crafted for the following amounts:

Card	Crafting cost	Disenchanting
Maelstrom Portal	100	20
Golden Maelstrom Portal	800	100

Notes

• This spell has two steps:
  • First, it deals its area of effect damage to all enemy minions, queuing and resolving triggers in order of play (see damage for details);
  • Then, it summons a random 1-Cost minion, queuing and resolving triggers.

Strategy

A superior version of the mage's Arcane Explosion. The boardwide damage effect is even better on a Shaman, as they have easier access (albeit mostly random) to Spell Damage bonuses via the Wrath of Air Totem. The additional 1-cost minion is also a big nuisance for enemies.

Maelstrom Portal is a great early-game play and stifles aggressive enemies, but with Spell Damage it can create a huge tempo swing late-game as well. Against pure control decks, it can be used at will simply to summon a minion.

Possible summons

The following table lists all collectible 1 mana minions, reflecting the range of possible minions summoned by this spell.

Name / Desc	Rarity	Type	Subtype	Class	Cost	Atk	HP	Description
Elven Archer	Free	Minion	General	Any	1	1	1	Battlecry: Deal 1 damage. Don't bother asking her out on a date. She'll shoot you down.
Goldshire Footman	Free	Minion	General	Any	1	1	2	Taunt If 1/2 minions are all that is defending Goldshire, you would think it would have been overrun years ago.
Grimscale Oracle	Free	Minion	Murloc	Any	1	1	1	Your other Murlocs have +1 Attack. These are the brainy murlocs. It turns out that doesn’t mean much.
Murloc Raider	Free	Minion	Murloc	Any	1	2	1	Mrrraggglhlhghghlgh, mrgaaag blarrghlgaahahl mrgggg glhalhah a bghhll graggmgmg Garrosh mglhlhlh mrghlhlhl!!
Northshire Cleric	Free	Minion	General	Priest	1	1	3	Whenever a minion is healed, draw a card. They help the downtrodden and distressed. Also they sell cookies.
Stonetusk Boar	Free	Minion	Beast	Any	1	1	1	Charge This card is boaring.
Timber Wolf	Free	Minion	Beast	Hunter	1	1	1	Your other Beasts have +1 Attack. Other beasts totally dig hanging out with timber wolves.
Voidwalker	Free	Minion	Demon	Warlock	1	1	3	Taunt No relation to "The Voidsteppers", the popular Void-based dance troupe.
Voodoo Doctor	Free	Minion	General	Any	1	2	1	Battlecry: Restore 2 Health. Voodoo is an oft-misunderstood art. But it is art.
Abusive Sergeant	Common	Minion	General	Any	1	1	1	Battlecry: Give a minion +2 Attack this turn. ADD ME TO YOUR DECK, MAGGOT!
Acherus Veteran	Common	Minion	General	Any	1	2	1	Battlecry: Give a friendly minion +1 Attack. This is my Runeblade. There are many like it but this one is mine.
Acornbearer	Common	Minion	General	Druid	1	2	1	Deathrattle: Add two 1/1 Squirrels to your hand. You'd be nuts to mess with the squirrel squad.
Air Elemental	Common	Minion	Elemental	Shaman	1	2	1	Can't be targeted by spells or Hero Powers. Makes a mean puff pastry.
Alleycat	Common	Minion	Beast	Hunter	1	1	1	Battlecry: Summon a 1/1 Cat. To be a cool cat in Gadgetzan, you gotta have bling.
Animated Berserker	Common	Minion	General	Warrior	1	1	3	After you play a minion, deal 1 damage to it. He'd be a lot easier to animate if he would just stand still.
Arcane Anomaly	Common	Minion	Elemental	Any	1	2	1	Whenever you cast a spell, give this minion +1 Health. He used to get work as a Spatial Anomaly, but he got tired of having his polarity reversed.
Arcane Artificer	Common	Minion	Elemental	Mage	1	1	2	Whenever you cast a spell, gain Armor equal to its Cost. Ethereal armor dissipates in 6 hours which can cause extreme awkwardness for first time buyers.
Argent Squire	Common	Minion	General	Any	1	1	1	Divine Shield "I solemnly swear to uphold the Light, purge the world of darkness, and to eat only burritos." - The Argent Dawn Oath
Beaming Sidekick	Common	Minion	General	Any	1	1	2	Battlecry: Give a friendly minion +2 Health. Sure, I'll carry the water! And the food! And the tents! And the cursed monkey paw!
Bladed Cultist	Common	Minion	General	Rogue	1	1	2	Combo: Gain +1/+1. He has a poor understanding of the law of diminishing returns.
Blood Imp	Common	Minion	Demon	Warlock	1	0	1	Stealth. At the end of your turn, give another random friendly minion +1 Health. Imps are content to hide and viciously taunt everyone nearby.
Brave Archer	Common	Minion	General	Hunter	1	2	1	Inspire: If your hand is empty, deal 2 damage to the enemy hero. This is a "bearly" concealed reference.
Buccaneer	Common	Minion	Pirate	Rogue	1	2	1	Whenever you equip a weapon, give it +1 Attack. The best part of buccaneering is the pants.
Cloakscale Chemist	Common	Minion	General	Any	1	1	2	Stealth Divine Shield Her suit was fitted using a scale model.
Clockwork Gnome	Common	Minion	Mech	Any	1	2	1	Deathrattle: Add a Spare Part card to your hand. Clockwork gnomes are always asking what time it is.
Cogmaster	Common	Minion	General	Any	1	1	2	Has +2 Attack while you have a Mech. After a while, you don't see the cogs and sprockets. All you see is a robot, a spider tank, a deathray...
Daring Fire-Eater	Common	Minion	General	Mage	1	1	1	Battlecry: Your next Hero Power this turn deals 2 more damage. A few hours later he DESTROYED the arena bathrooms.
Deadscale Knight	Common	Minion	Murloc	Any	1	1	1	Lifesteal His favorite spell is Chum Explosion.
Dire Mole	Common	Minion	Beast	Any	1	1	3	You especially don't want to make a dire mountain out of a dire mole hill.
Dust Devil	Common	Minion	Elemental	Shaman	1	3	1	Windfury. Overload: (2) Westfall is full of dust devils. And buzzards. And crazed golems. And pirates. Why does anyone live here?
Emerald Reaver	Common	Minion	Beast	Any	1	2	1	Battlecry: Deal 1 damage to each hero. Not to be confused with clubbing enthusiast Emerald Raver.
Enchanted Raven	Common	Minion	Beast	Druid	1	2	2	Once upon a midnight restive, Medivh pondered, feeling festive!
Eternium Rover	Common	Minion	Mech	Warrior	1	1	3	Whenever this minion takes damage, gain 2 Armor. He's all beeps and smiles but you're just a walking pile of armor to him.
Faithful Lumi	Common	Minion	Mech	Any	1	1	1	Battlecry: Give a friendly Mech +1/+1. They're a little light-headed.
Fiery Bat	Common	Minion	Beast	Hunter	1	2	1	Deathrattle: Deal 1 damage to a random enemy. He'll always be our first.
Fire Fly	Common	Minion	Elemental	Any	1	1	2	Battlecry: Add a 1/2 Elemental to your hand. Arch nemeses: small children with glass jars.
Flame Imp	Common	Minion	Demon	Warlock	1	3	2	Battlecry: Deal 3 damage to your hero. Imps like being on fire. They just do.
Gadgetzan Jouster	Common	Minion	General	Any	1	1	2	Battlecry: Reveal a minion in each deck. If yours costs more, gain +1/+1. It's not HER fault you didn't put a spinning saw blade on your horse.
Glacial Shard	Common	Minion	Elemental	Any	1	2	1	Battlecry: Freeze an enemy. Ice, ice, baby!
Glow-Tron	Common	Minion	Mech	Paladin	1	1	3	Magnetic They tried for weeks to make a stealth version, but eventually decided to just let it glow.
Goblin Bomb	Common	Minion	Mech	Any	1	0	2	Deathrattle: Deal 2 damage to the enemy hero. They're Dr. Boom's babies. His baby boomers.
Grimscale Chum	Common	Minion	Murloc	Paladin	1	2	1	Battlecry: Give a random Murloc in your hand +1/+1. Listen, see? We'll take 'em to the docks, see? And throw 'em in the sea, see?
Gurubashi Chicken	Common	Minion	Beast	Any	1	1	1	Overkill: Gain +5 Attack. “Ya hold it by da feet, mon. Den ya THROW.”
Helpless Hatchling	Common	Minion	Beast	Any	1	1	1	Deathrattle: Reduce the Cost of a Beast in your hand by (1). It can’t be all that helpful. Not wif dose widdle wings!
Jar Dealer	Common	Minion	General	Any	1	1	1	Deathrattle: Add a random 1-Cost minion to your hand. What's in the jar? It could be anyone!
Jeweled Macaw	Common	Minion	Beast	Hunter	1	1	1	Battlecry: Add a random Beast to your hand. It’s not LITERALLY jeweled. The goblins were terribly disappointed.
Kabal Lackey	Common	Minion	General	Mage	1	2	1	Battlecry: The next Secret you play this turn costs (0). I'll tell you one thing he doesn't lack: GUMPTION.
Kobold Librarian	Common	Minion	General	Warlock	1	2	1	Battlecry: Draw a card. Deal 2 damage to your hero. Kobolds sort books using a gooey decimal system.
Leper Gnome	Common	Minion	General	Any	1	1	1	Deathrattle: Deal 2 damage to the enemy hero. He really just wants to be your friend, but the constant rejection is starting to really get to him.
Lowly Squire	Common	Minion	General	Any	1	1	2	Inspire: Gain +1 Attack. But not the lowliest!
Malchezaar's Imp	Common	Minion	Demon	Warlock	1	1	3	Whenever you discard a card, draw a card. Malchezaar used to have an imp named Dobby working for him, but there was a tragic accident.
Mecharoo	Common	Minion	Mech	Any	1	1	1	Deathrattle: Summon a 1/1 Jo-E Bot. Its project name was KAN-GA. The little one was R-00.
Mistress of Mixtures	Common	Minion	General	Any	1	2	2	Deathrattle: Restore 4 Health to each hero. Her favorite mixture is cola and lime.
Murmy	Common	Minion	Murloc	Any	1	1	1	Reborn Unlike other mummies, they rolled him up with rice, sliced cucumbers, and soy sauce on the side.
N'Zoth's First Mate	Common	Minion	Pirate	Warrior	1	1	1	Battlecry: Equip a 1/3 Rusty Hook. Hates when N'Zoth yells "Ahoy Matey!!", but there's not really much he can do about it.
Pharaoh Cat	Common	Minion	Beast	Rogue	1	1	2	Battlecry: Add a random Reborn minion to your hand. Mightiest of mousers, enduring in kingship of the upper and lower cat tree, conqueror of the red dot, the all-wise Catshepsut.
Pit Snake	Common	Minion	Beast	Rogue	1	2	1	Poisonous It could be worse. It could be a Snake Pit.
Possessed Villager	Common	Minion	General	Warlock	1	1	1	Deathrattle: Summon a 1/1 Shadowbeast. It's like a pinata! A lame disgusting horrific pinata.
Potion Vendor	Common	Minion	General	Any	1	1	1	Battlecry: Restore 2 Health to all friendly characters. Everyone gets two because that's all she can hold.
Righteous Protector	Common	Minion	General	Paladin	1	1	1	Taunt Divine Shield Original name was Tubular Protector, but this seems more bodacious.
Runic Egg	Common	Minion	General	Any	1	0	2	Deathrattle: Draw a card. Oh man! Runic omelettes are the best!
Sanguine Reveler	Common	Minion	General	Warlock	1	1	1	Battlecry: Destroy a friendly minion and gain +2/+2. Have some! This drink is to die for!
Saronite Taskmaster	Common	Minion	General	Any	1	2	3	Deathrattle: Summon a 0/3 Free Agent with Taunt for your opponent. Don't even think of asking for time off.
Shieldbearer	Common	Minion	General	Any	1	0	4	Taunt Have you seen the size of the shields in this game?? This is no easy job.
Skaterbot	Common	Minion	Mech	Any	1	1	1	Magnetic Rush "See you later bot" - Jaina
Southsea Deckhand	Common	Minion	Pirate	Any	1	2	1	Has Charge while you have a weapon equipped. Pirates are into this new fad called "Planking".
Springpaw	Common	Minion	Beast	Hunter	1	1	1	Rush Battlecry: Add a 1/1 Lynx with Rush to your hand. The terrible thing about lynxes is lynxes are terrible things. Their teeth are made out of biting, their paws are made out of springs!
Swamp Dragon Egg	Common	Minion	General	Any	1	0	3	Deathrattle: Add a random Dragon to your hand. Would you eat them in a ditch? Would you eat them with a witch?
Swamp Leech	Common	Minion	Beast	Any	1	2	1	Lifesteal A face only a druid could love.
Swashburglar	Common	Minion	Pirate	Rogue	1	1	1	Battlecry: Add a random card to your hand (from your opponent's class). Was almost named "Swashb-AAAARRHHH-gler"
Tentacle of N'Zoth	Common	Minion	General	Any	1	1	1	Deathrattle: Deal 1 damage to all minions. Because EVERYDAY is the Day of the Tentacle of N'zoth.
Tournament Attendee	Common	Minion	General	Any	1	2	1	Taunt He was so excited to get season tickets to this year's Grand Tournament. He normally doesn't get them at first and has to buy them from Ogre scalpers.
Toxfin	Common	Minion	Murloc	Any	1	1	2	Battlecry: Give a friendly Murloc Poisonous. I'm addicted to him, but I know that he's Toxfin.
Tunnel Trogg	Common	Minion	General	Shaman	1	1	3	Whenever you Overload, gain +1 Attack per locked Mana Crystal. Sure, they're ugly, but they live in tunnels. You try your beauty routine without natural light.
Twilight Whelp	Common	Minion	Dragon	Priest	1	2	1	Battlecry: If you're holding a Dragon, gain +2 Health. The twilight whelps are basically magic-vampires. Despite this, they are not a reference to any popular series of novels.
Undertaker	Common	Minion	General	Any	1	1	2	Whenever you summon a minion with Deathrattle, gain +1 Attack. In a world where you can run to a spirit healer and resurrect yourself, Undertakers do pretty light business.
Warbot	Common	Minion	Mech	Warrior	1	1	3	Has +1 Attack while damaged. Mass production of warbots was halted when it was discovered that they were accidentally being produced at "sample size."
Wartbringer	Common	Minion	General	Shaman	1	2	1	Battlecry: If you played 2 spells this turn, deal 2 damage. “Does she cause them with magic, or just…like have a bucket she brings with her?”
Wax Elemental	Common	Minion	Elemental	Any	1	0	2	Taunt Divine Shield Takes double damage from wick-based weapons
Webspinner	Common	Minion	Beast	Hunter	1	1	1	Deathrattle: Add a random Beast card to your hand. Spider cocoons are like little piñatas!
Witch's Apprentice	Common	Minion	Beast	Shaman	1	0	1	Taunt Battlecry: Add a random Shaman spell to your hand. Is she a frog that became a witch, or a witch that became a frog?
Witchwood Imp	Common	Minion	Demon	Warlock	1	1	1	Stealth Deathrattle: Give a random friendly minion +2 Health. THIS wood imp. Stop asking!
Worgen Infiltrator	Common	Minion	General	Any	1	2	1	Stealth If you want to stop a worgen from infiltrating, just yell, "No! Bad boy!"
Wretched Tiller	Common	Minion	General	Any	1	1	1	Whenever this minion attacks, deal 2 damage to the enemy hero. If you ever tried to plow permafrost, you’d be wretched, too.
Young Dragonhawk	Common	Minion	Beast	Any	1	1	1	Windfury They were the inspiration for the championship Taurenball team: The Dragonhawks.
Zealous Initiate	Common	Minion	General	Any	1	1	1	Deathrattle: Give a random friendly minion +1/+1. Ok, Initiate. You need to settle down and do your job. In this case, that means die so someone else can get a minor buff.
Zombie Chow	Common	Minion	General	Any	1	2	3	Deathrattle: Restore 5 Health to the enemy hero. Zombie. It's what's for dinner.
Angry Chicken	Rare	Minion	Beast	Any	1	1	1	Has +5 Attack while damaged. There is no beast more frightening (or ridiculous) than a fully enraged chicken.
Babbling Book	Rare	Minion	General	Mage	1	1	1	Battlecry: Add a random Mage spell to your hand. His idol is the Green Hills of Stranglethorn, and he won't shut up about it.
Bloodsail Corsair	Rare	Minion	Pirate	Any	1	1	2	Battlecry: Remove 1 Durability from your opponent's weapon. Every pirate uses the same four digits to access Automated Gold Dispensers. It's called the "Pirate's Code".
Brazen Zealot	Rare	Minion	General	Paladin	1	2	1	Whenever you summon a minion, gain +1 Attack. Some paladins really Light it up.
Crystalline Oracle	Rare	Minion	Elemental	Priest	1	1	1	Deathrattle: Copy a card from your opponent's deck and add it to your hand. Being made of light has its disadvantages, but at least it's always looking on the bright side.
Dragon Egg	Rare	Minion	General	Any	1	0	2	Whenever this minion takes damage, summon a 2/1 Whelp. Think of them as bullets for your dragon gun.
Feral Gibberer	Rare	Minion	General	Any	1	1	1	After this minion attacks a hero, add a copy of it to your hand. It's certainly not civilized gibbering.
Gravelsnout Knight	Rare	Minion	General	Any	1	2	3	Battlecry: Summon a random 1-Cost minion for your opponent. The mole of La Mancha rides again!
Injured Kvaldir	Rare	Minion	General	Any	1	2	4	Battlecry: Deal 3 damage to this minion. Don't worry. With a little skin cream he's going to clear right up.
Lightwarden	Rare	Minion	General	Any	1	1	2	Whenever a character is healed, gain +2 Attack. She’s smaller than her sisters Mediumwarden and Heavywarden.
Murloc Tidecaller	Rare	Minion	Murloc	Any	1	1	2	Whenever you summon a Murloc, gain +1 Attack. This guy gets crazy strong at family reunions.
Pogo-Hopper	Rare	Minion	Mech	Rogue	1	1	1	Battlecry: Gain +2/+2 for each other Pogo-Hopper you played this game. Once you hop, you just can't stop!
Raptor Hatchling	Rare	Minion	Beast	Hunter	1	2	1	Deathrattle: Shuffle a 4/3 Raptor into your deck. They’re just baby teeth. Lots and lots of baby teeth.
Reliquary Seeker	Rare	Minion	General	Warlock	1	1	1	Battlecry: If you have 6 other minions, gain +4/+4. The Reliquary considers itself the equal of the League of Explorers. The League of Explorers doesn't.
Secretkeeper	Rare	Minion	General	Any	1	1	2	Whenever a Secret is played, gain +1/+1. Where is Mankrik's wife? She'll never tell.
Selfless Hero	Rare	Minion	General	Paladin	1	2	1	Deathrattle: Give a random friendly minion Divine Shield. "Don't worry about me… I'll just be here... under these tentacles."
Shimmerfly	Rare	Minion	Beast	Hunter	1	1	1	Deathrattle: Add a random Hunter spell to your hand. Plenty of buzz around this card.
Sludge Slurper	Rare	Minion	Murloc	Shaman	1	2	1	Battlecry: Add a Lackey to your hand. Overload: (1) You can't stop slurping this delicious sludge!
Small-Time Buccaneer	Rare	Minion	Pirate	Any	1	1	1	Has +2 Attack while you have a weapon equipped. "Oh, I'm not serious about it. I only pirate on the weekends."
Spirit of the Dead	Rare	Minion	General	Priest	1	0	3	Stealth for 1 turn. After a friendly minion dies, shuffle a 1-Cost copy of it into your deck. Just because you’re dead doesn’t mean you’re off the team.
Spirit of the Raptor	Rare	Minion	General	Druid	1	0	3	Stealth for 1 turn. After your hero attacks and kills a minion, draw a card. “Loti! LOTI! Drop it. Drop it Loti! Down! Down Loti!”
Spirit of the Rhino	Rare	Minion	General	Warrior	1	0	3	Stealth for 1 turn. Your Rush minions are Immune the turn they're summoned. Where did they get this preposterous hypothesis?
Test Subject	Rare	Minion	General	Priest	1	0	2	Deathrattle: Return any spells you cast on this minion to your hand. "Now I feel... REALLY icky."
Young Priestess	Rare	Minion	General	Any	1	2	1	At the end of your turn, give another random friendly minion +1 Health. She can't wait to learn Power Word: Fortitude Rank 2.
Crystallizer	Epic	Minion	General	Any	1	1	3	Battlecry: Deal 5 damage to your hero. Gain 5 Armor. This elf's winning the arms race.
Emerald Hive Queen	Epic	Minion	Beast	Any	1	2	3	Your minions cost (2) more. She rules the emerald hive at the end of the yellow brick trail.
Forbidden Ancient	Epic	Minion	General	Druid	1	1	1	Battlecry: Spend all your Mana. Gain +1/+1 for each mana spent. This Ancient was banned from the local tavern after tucking a 'Dr. Boom' up its sleeve.
Gurubashi Offering	Epic	Minion	General	Any	1	0	2	At the start of your turn, destroy this and gain 8 Armor. For a limited time, loa blessings are on a pray-one-get-two deal (on selected sacrifices only).
Hungry Crab	Epic	Minion	Beast	Any	1	1	2	Battlecry: Destroy a Murloc and gain +2/+2. Murloc. It's what's for dinner.
Meanstreet Marshal	Epic	Minion	General	Paladin	1	1	2	Deathrattle: If this minion has 2 or more Attack, draw a card. Remember, submit your bribes directly to the Marshal - it's the law!
Mogu Cultist	Epic	Minion	General	Any	1	1	1	Battlecry: If your board is full of Mogu Cultists, sacrifice them all and summon Highkeeper Ra. Mogu cultists have the worst team-building exercises.
Shadowbomber	Epic	Minion	General	Priest	1	2	1	Battlecry: Deal 3 damage to each hero. Shadowbomber does her job, but she's kind of phoning it in at this point.
Town Crier	Epic	Minion	General	Warrior	1	1	2	Battlecry: Draw a Rush minion from your deck. When he was younger, he was the town crybaby.
Vilefin Inquisitor	Epic	Minion	Murloc	Paladin	1	1	3	Battlecry: Your Hero Power becomes 'Summon a 1/1 Murloc.' Nobody expects the Vilefin Inquisition!
Weasel Tunneler	Epic	Minion	Beast	Any	1	1	1	Deathrattle: Shuffle this minion into your opponent's deck. He's the reason the First Bank of Gadgetzan has steel floors.
Chameleos	Legendary	Minion	Beast	Priest	1	1	1	Each turn this is in your hand, transform it into a card your opponent is holding. He's everyone you want to be.
Patches the Pirate	Legendary	Minion	Pirate	Any	1	1	1	After you play a Pirate, summon this minion from your deck. What do sailors yell when Patches steals their treasure chest full of laws and other things being transported to parliament for a vote? "The Eyes have it!"
Shifter Zerus	Legendary	Minion	General	Any	1	1	1	Each turn this is in your hand, transform it into a different minion. It's like being able to play with THREE angry chickens!
Sir Finley Mrrgglton	Legendary	Minion	Murloc	Any	1	1	3	Battlecry: Discover a new basic Hero Power. In addition to fluent Common, he also speaks fourteen dialects of 'mrgl'.
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Lore

This spell represents one of Karazhan's many "precisely calibrated portals attuned to a variety of exotic locales" - in this case, the Maelstrom, the former location of the Well of Eternity before it was destroyed in the Great Sundering. During the Black Empire, it was also the location of Y'Shaarj, the most powerful of the Old Gods.

The portal itself is found at the top level of the tower, which also features as the fifth wing in One Night in Karazhan - The Spire.

In World of Warcraft

The Maelstrom Portal in World of Warcraft

Following Deathwing's reemergence into Azeroth, heroes of the Alliance and the Horde travelled to the Maelstrom to assist Thrall in attempting to seal the rift between Deepholm and Azeroth. A portal to the Maelstrom was briefly to be found in the capital cities; after journeying to Deepholm the portals were redirected there.

The Maelstrom

From Wowpedia:

The Maelstrom is the gigantic rift that was created when the Well of Eternity collapsed into itself during the Great Sundering. Located in the middle of the Great Sea - which the Great Sundering created - the Maelstrom appears as a massive, fierce vortex of water.

Gallery

Maelstrom Portal, full art

The Maelstrom in World of Warcraft

Patch changes

• Patch 6.0.0.13921 (2016-08-09): Added.