Thaddius (boss)

Thaddius (boss)
Last updated:	August 30, 2023

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

Normal and Heroic
Auto-cast

Special cards

Thaddius, full art

Decks

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

Tips

General tips

• 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, cards like Nerubian Egg is an excellent card for this fight.

Heroic

• Thaddius summons Stalagg (boss card) and Feugen (boss card) 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.
  • Early removal is key to deal with Stalagg and Feugen before they deal too much damage.

Decklists

• The Construct Quarter Heroic Boss Deck Guides
• Decks for defeating Heroic Thaddius

Rewards

Wing completion

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

Dialogue

Thaddius in World of Warcraft

Before match

Kel'Thuzad

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

Introduction

Thaddius

I must obey!

Emote Response

Thaddius

Kill!

Hero Power

Thaddius

You die now!

Death

Thaddius

Thank you...

Kel'Thuzad

Interloper! This is the final straw!

Lore

Thaddius in the Curse of Naxxramas promotional art

Thaddius is a raid boss in the Naxxramas raid.

In Curse of Naxxramas

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.

In World of Warcraft

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