Gorgrom the Dragon-Eater Boss Guide for Book of Heroes (Rexxar)

The boss uses a Ogre-themed Big Control Warrior deck. The deck contains common Control Warrior cards like Sword and Board, Shield Slam, and Reaper's Scythe. The boss's deck also notably contains many copies of Bloodmaul Brute. The boss will additionally use the Monstrous Growth Hero Power to gain Armor throughout the fight.

For the encounter you will be given a mixed Hunter deck that includes parts of decks used previously within the Book of Rexxar; it contains Secrets, Rush minions, spells in addition to special cards like Spirit, and Gronn Trap. You will additionally have access to the Axe Toss Rank 2 Hero Power for the encounter.

In your opening hand, you should look for strong early-game cards like Phase Stalker, Scavenger's Ingenuity, and Animal Companion.

Due to the high Health of the boss and the ease in which it can gain Armor, it is important to play out your turns with a long-term plan in mind. You should make full use of your Axe Toss Rank 2 Hero Power to maximise your value against the boss.

Once you reach the late game you should do your best to be prepared for Bloodmaul Brutes where necessary. This can largely be done by keeping your minions at 3 Health or more. However, if any Bloodmaul Brutes do stick to the board, Exploding Bloatbat is an excellent way to deal with them. Triggering the Deathrattle effect, either by trading, using Rapid Fire, on your own minion, or copying the Deathrattle with Mok'Nathal Lion, allows you to clear off any Bloodmaul Maulers and isolate the brutes for your Hero Power so that they can be easily finished off.

When it comes to closing out the game, it is theoretically possible to win via fatigue. However, it is more advisable to slowly grind down the boss with your minions, and taking to stick a Gronn Trap on the board in the process. While the boss will eventually die with this method, the games will still go long and it is therefore inadviseable to play Tracking to avoid fatigue, unless you are in danger of losing the game. However, other card draw effects, like Scavenger's Ingenuity, Call Pet, and Phase Stalker are generally fine unless you are committed to winning through fatigue instead of Gronn Traps.