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The Coren Direbrew encounter is a fairly easy boss fight. You can queue for him via the dungeon finder tool upon reaching level 99.

• To start the encounter, talk to Direbrew, it is best if you let the tank do this so that they can pickup the boss and his adds immediately.
• DPS should focus on Direbrew the entire encounter, do not worry about the adds, they can be tanked throughout the encounter and killed via cleaves and other AOE.
• Adds also spawn throughout the encounter via tunnelers that pop out of the ground. These tunnelers will interrupt casting if you're still standing on them when they break through, so move away if the ground starts to come up under your feet.
• Throughout the encounter, Isla Direbrew will randomly chuck mugs of beer at players. Make sure to right click them in your inventory to drink them before she throws a second mug to you. If you do not drink the first mug in time, she will stun you for 6 seconds.

After Direbrew is killed, any remaining adds will despawn. For the first kill each day, you will be rewarded a Keg-Shaped Treasure Chest. Direbrew also has a chance to drop one of the following trinkets each time he is killed: Coren Direbrew

Criterion of  Direbrewfest.