Grommash Hellscream Boss Guide for Book of Heroes (Jaina)

Grommash Hellscream uses a Horde-themed Dragon Warrior deck featuring many weapon synergies. The boss uses the Equip Gorehowl Hero Power as a consistent weapon source.

You will be provided with a Tempo Mage deck full of cheap spells and spell-synergy minions. You will also have access to the encounter.

From turn 7 onward Thrall will regularly cast Shaman spells that bolster your board.

In your mulligan, you should look for cheap early-game plays that cost 3 Mana or fewer, such as Violet Spellwing, Frostbolt, Sorcerer's Apprentice, and Chenvaala.

For the first 3 turns, you should focus on keeping the board clear and under control as much as possible. Following that, you should try to use your Summon Elemental each turn thereafter. Your Hero Power not only gives you a free Water Elemental each turn, but gives you a consistent way to Freeze the boss each turn. With this in mind, your top priority each turn should be to Freeze the boss, ideally with a Water Elemental but Frostbolt can be used if needed. Once the boss is Frozen, you should be easily able to control the board and slowly kill off the boss in any way you see fit.