In the second encounter of the chapter "The Big and the Bad", you're fighting Gruul the Dragonkiller.
- Avoid playing Dragons. Slayer of the Mighty is a strong hate-card towards the tribe.
- Try to find balance between going wide and having big single targets, as Gruul has answers to both in Sleep with the Fishes, Brawl, and Executes.
- The boss has a decent amount of Armor gain so don't try to rush him down. Keep control of the board.
- Gruul's Hero Power will punish playing low-health minions, so you should pick a midrange/control deck for the fight.
Watch Out For These Cards
Mogor the Ogre can complicate your attacks a lot if you have no good way of answering his threat.
Bloodboil Brute can catch you off-guard if you don't pay attention to the amount of damaged minions of board. You should also pay attention to the 3-Health limit when trading if you want to avoid Sleep with the Fishes.
You'll also want to kill off Armored Goon quite quickly to deny his effect from giving too much value to Gruul.
Gruul the Dragonkiller's Deck
This is the deck Gruul the Dragonkiller uses in the Trial by Felfire Challenges adventure.
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