Boss
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Encountered in Round
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Hero Power
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Notes
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first
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last
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Bink the Burglar
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1
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Coin: "Gain 1 Mana Crystal this turn only." (0 Mana, autocast)
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The rarest round 1 boss.
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Giant Rat
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1
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Rat Race: "Summon two 1/1 rats." (2 Mana)
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Wee Whelp
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1
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Baby Breath: "Deal 2 damage." (2 Mana)
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A. F. Kay
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4
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Idle: "Do nothing" (2 Mana)
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Does nothing until Turn 6, then plays Boots of Haste to flood the board with 8/8 minions.
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Battlecrier Jin'zo
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4
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5
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Battle Totem: "Battlecries trigger twice." (Passive)
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Blackseed
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4
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5
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Evolvomancy: "Transform a minion into a random one that costs (1) more." (0 Mana)
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Plays a Token Druid deck.
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6
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7
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Greater Evolution: "Transform a minion into a random one that costs (3) more." (1 Mana)
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Brimstone Warden
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4
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Dispel Ward: Silence your minions. (5 Mana)
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Starts with four Stone Golems and summons more from his hand (Letting him silence them is an almost immediate defeat).
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Bristlesnarl
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6
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7
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Hunter's Call: Reduce the cost of cards in your hand by 1 (3 Mana, autocast)
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Plays a midrange Hunter deck.
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Candlebeard
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2
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3
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Charge!: "Give a friendly minion Charge." (1 Mana)
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Plays an aggressive Pirate deck.
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6
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7
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Charrrge!: "After you play a minion, give it Charge." (Passive)
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Chronomancer Inara
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7
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Stolen Time: Destroy 3 of your mana crystals. Take an extra turn (10 Mana, autocast)
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Deck contains Medivh's cards
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Elder Brandlemar
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2
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3
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Dampen Magic: "Put a 'Counterspell' Secret into the battlefield." (2 Mana, autocast)
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Elder Jari
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4
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5
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Mystic Barrier: "Gain 3 armor." (1 mana)
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Frostfur
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2
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3
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Freeze: "Freeze a minion." (2 Mana)
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Fungalmancer Flurgl
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4
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5
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Fungal Infection: "Give your minions +1/+1." (2 Mana)
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Plays a Murloc deck.
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George and Karl
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6
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- Divinity: "Give all your minions Divine Shield." (2 Mana) (George)
- The Silver Hand: "Summon two 1/1 Silver Hand Recruits." (2 Mana) (Karl)
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30 HP each. Starts with George and switches to Karl on defeat. The boss can also swap between George and Karl in the middle of the game. Both play swarm-based Paladin decks.
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Gnosh the Greatworm
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6
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Swallow Whole: "Destroy a random minion with the highest attack." (2 Mana, autocast)
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If the Hero Power kills a Poisonous minion, Gnosh automatically dies.
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Graves the Cleric
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2
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3
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Light's Will: "Restore 2 health to all minions" (0 Mana)
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Gutmook
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4
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5
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Digest Magic: "Whenever your opponent casts a spell, summon a Tunnel Trogg." (Passive)
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Plays an Overload-themed Shaman deck.
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6
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7
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Metabolized Magic: "Whenever your opponent casts a spell, draw a card. It costs (1)". (Passive)
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Ixlid
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6
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Sprouting Spore: "Summon an extremely deadly spore." (2 Mana, autocast)
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Spore is a 1 mana 1/1 that is poisonous to heroes. Additionally, Ixlid always starts with 20 health, despite most round 6 bosses having 50 health.
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Jeeru
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6
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7
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Three Wee Wishes: Both players draw 3 cards (1 Mana, autocast)
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Plays a Druid mill deck, but ironically equally susceptible to her own milling.
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Kraxx
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4
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5
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Giant Stomp: "Deal 1 damage to all enemy minions" (2 Mana)
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Lava-Filled Chamber
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6
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7
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The Floor is Lava: "After a minion is played, deal 2 damage to it." (Passive)
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Plays mostly burn spells and minions that deal direct damage, also has Flamestrikes to clear the board.
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Lyris the Wild Mage
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4
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5
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Arcane Infusion: "Add an Arcane Missiles to your hand." (1 Mana)
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Deck contains mostly Flamewakers, as well as Arcane Giants and Arcane Intellects
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Mushhuckster Max
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4
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5
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Mushroom, Mushroom: "Craft a custom mushroom potion." (2 mana, autocast)
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Custom potions are 1-Mana Kazakus Potions
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Overseer Mogark
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2
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3
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Cruel Words: "Deal 1 damage to a friendly minion and give it +2 attack" (1 Mana)
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5
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7
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Searing Lash: "Deal 1 damage to a friendly minion and give it +5 attack" (1 Mana)
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Pathmaker Hamm
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2
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3
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Unstable Explosion: "Deal 1 damage to 2 random enemies" (1 Mana, Autocast)
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A bomb-themed deck with Mad Bombers, Madder Bombers, and Bomb Squads. His Hero Power can only hit each target once per turn, so if your Hero is the only target, you'll only sustain a single hit of 1 (or 2) damage.
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5
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7
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Unstable Demolition: "Deal 2 damage to 3 random enemies" (2 Mana, Autocast)
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Russell the Bard
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4
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5
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Alluring Tune: "Gain control of an enemy minion with 2 or less attack" (2 Mana)
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If you wait a while before ending your turn, he will start to sing the Kobolds and Catacombs theme song.
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Seriona
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2
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3
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Fading Light: "Give a minion -1 attack" (2 Mana)
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Dragon Priest deck; contains multiple Duskbreaker and Blackwing Corruptor
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Spiritspeaker Azun
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4
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5
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Totem of the Dead: All deathrattles trigger twice (Passive)
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Plays an Awaken the Makers deck
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Tad
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6
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Catch and Release: Summon a random minion from your deck (0 mana, autocast)
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Rare. Has no hand. Tad will not draw cards, and therefore will not fatigue. He will not play cards even if given them (e.g.: by Mulch). Minions are not summoned randomly but in cost order, unless they are returned to his deck via cards like Psychic Scream. If Tad takes no damage (including from his own minions) then on turn 11 he will summon a "Sunken Chest" which, when killed, it adds Tad's Pole to your deck.
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Thaddock the Thief
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4
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5
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Tactical Retreat: "Return a friendly minion to your hand" (1 Mana)
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Plays The Caverns Below deck
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The Mothergloop
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7
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Gloop: "Give minions in your hand +1/+1." (2 Mana, autocast)
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Deck consists of many self-duplicating cards to make the most of its handbuffs.
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Trapped Room
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6
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7
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Alarm: "Whenever you reveal a Secret, summon a 3/3 Sawblade." (Passive)
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Deck consists of many secrets, as well as some Secretkeepers and Ethereal Arcanists.
One valid strategy is to do nothing other than clearing/controlling the board. Boss' hand will be clogged up with secrets and eventually it will die to fatigue.
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Treasure Vault
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6
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7
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Doors Are Closing: "End the game" (5 mana, auto-cast)
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Starts the game with seven 0/10 Treasure Coffers, and has no health, deck, or hand. Destroying the Coffers puts a random playable Treasure in the player's deck for the current Run. There is no way the player can lose on this boss (other than conceding). (only encountered on rounds 6 and 7 so far, but supposedly you can encounter it in round 2-5 aswell (source?))
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Voodoomaster Vex
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6
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7
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Chaos Totem: All Battlecries and Deathrattles trigger twice. (Passive)
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Waxmancer Sturmi
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3
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5
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Sculpt Wax: "Summon a 1/1 copy of a minion." (1 Mana)
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Plays a Deathrattle-themed Hunter deck.
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6
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7
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Harden Sculpture: "Summon a copy of a minion." (3 Mana)
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Whompwhisker
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4
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5
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Join the Fray: "Both players Recruit a minion." (2 Mana, autocast)
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Plays a deck filled with high-cost minions and tough Taunts, relying on his Hero Power to cheat them out.
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Azari, the Devourer
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8 (final boss)
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Devour: "Remove the top 2 cards of your opponent’s deck." (0 Mana, autocast)
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Plays a demon-themed Warlock deck.
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King Togwaggle
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8 (final boss)
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Magic Candle: "Find a Treasure!" (3 Mana)
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Treasures found are mostly playable Treasures the player could obtain during their Dungeon Run.
Occasionally deals 4 damage to a random enemy at the start of his turn.
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The Darkness
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8 (final boss)
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Encroaching Darkness: "Summon a 5/5 Darkspawn." (0 Mana, autocast)
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Players start with 3 Luminous Candles in their hand. Runs a Priest deck filled with darkness-based removal spells to control the board while its Darkspawn attack.
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Vustrasz the Ancient
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8 (final boss)
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Vindictive Breath: "Deal 1 damage to all enemies for each missing Master Chest." (0 Mana, autocast)
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Starts with 5 Master Chests in play.
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Xol the Unscathed
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8 (final boss)
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Beam Me Up!: "At the end of the turn, add a Beam card to your hand." (passive)
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Plays a Lakkari Sacrifice deck.
Xol's voice line indicates which beam has been chosen: Fatality (destroy all damaged enemy minions), Fatigue (destroy one of your opponent's mana crystals), Fear (shuffle a random enemy minion into your opponent's deck), Flame (deal 2 damage to all enemy minions), Flummox (take control of a random enemy minion), Frost (freeze a random enemy minion and the minions next to it)
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