Thaddius (boss)

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Curse of Naxxramas logo.png         The subject of this article is part of the Curse of Naxxramas adventure

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Thaddius(7794) Gold.png
Set: Curse of Naxxramas
Type: Hero
Health: 30 (Normal)
45 (Heroic)
Artist: Matt Dixon

Thaddius is the result of the most horrible and evil experiments in the Construct Quarter.

See this card on Hearthpwn

For the minion card of the same name, see Thaddius.

Thaddius is a boss found in the Curse of Naxxramas adventure. He is the fourth and final boss of the adventure's fourth wing, the Construct Quarter.

Hero Power[edit | edit source]

Normal and Heroic
Polarity Shift(7796).png

Special cards[edit | edit source]

Thaddius, full art

Heroic mode only[edit | edit source]


Decks[edit | edit source]

The below classes are listed purely for reference, and have no effect on the boss' use of the cards during the battle. Normal and Heroic

Class Card Quantity
Boss Supercharge 2
Priest Dark Cultist 2
Shaman Forked Lightning 2
Lightning Bolt 2
Lightning Storm 2
Unbound Elemental 2
Neutral Zombie Chow 2
Acidic Swamp Ooze 2
Haunted Creeper 2
Nerubian Egg 2
Shade of Naxxramas 2
Stoneskin Gargoyle 2
Sludge Belcher 4
Spectral Knight 2

Strategy[edit | edit source]

General tips[edit | edit source]

Use minions with auras that increase either Attack or both Attack and Health. His hero power will swap the current Attack and Health of all minions, making the bonuses permanent. The auras will then be reapplied, providing additional benefits. This process will repeat every turn.

0-attack minions will become 0-health, and therefore die, when the boss' hero power activates. For this reason, Nerubian Egg is an excellent card for this fight, essentially giving the player a 4/4 for 2 mana.

Heroic[edit | edit source]

Thaddius summons Stalagg and Feugen for free on his first turn. These boss minions do not possess Deathrattles and will not summon a Thaddius minion upon death. However, these minions' deaths will still count to trigger the player's Stalagg and Feugen's Deathrattles, allowing for a Thaddius minion to be summoned as early as turn 5.

Warlock is a good class for this fight, because it has several cheap cards, like Corruption, Corrupting Mist and Soulfire, that can deal with the initial Stalagg and Feugen before they deal too much damage.

Decklists[edit | edit source]

Videos[edit | edit source]

Rewards[edit | edit source]

Wailing Soul(7758).png

Wing completion[edit | edit source]

As the final boss of the Construct Quarter, defeating Thaddius also unlocks the following rewards:


Uncollectible[edit | edit source]


Dialogue[edit | edit source]

Thaddius in World of Warcraft

Before match

It's alive!! But you won't be, for long.


I must obey!

Emote Response


Hero Power

You die now!


Thank you...
Interloper! This is the final straw!

Lore[edit | edit source]

Thaddius in the Curse of Naxxramas promotional art

Thaddius is a raid boss in the Naxxramas raid.

In Curse of Naxxramas[edit | edit source]

The final hulking horror that stands within the Construct Quarter is Thaddius. Pieced together from the flesh of the innocent, this massive abomination dwells in one of Naxxramas’ experimental laboratories, flanked by two huge wights—Stalagg and Feugen. Powerful bolts of electricity arc through the laboratory, supercharging Thaddius and his wight minions.[1]

In World of Warcraft[edit | edit source]

In order to confront Thaddius in the Naxxramas raid, players had to first kill Feugen and Stalagg. If they were not killed within 5 seconds of each other they would resurrect each other with full health, forcing raids to down them almost simultaneously.

"Thaddius, built from the flesh of women and children, it is said that their souls are fused together - eternally bound within that foul prison of flesh."
- Commander Eligor Dawnbringer

Patch changes[edit | edit source]

References[edit | edit source]