The Boss uses Rock Buster on the Tank, dealing heavy damage and applying a 25% damage taken increase for 6 seconds on the Tank.
Ol’ Waxbeard targets the furthest player in your group, and then charges towards him. This deals very high damage to players struck in its path, knocks them and also kills all adds.
Main mechanic of this fight is XX, causing several adds to run into the encounter area all the time. These adds attack with melee attacks the current Tank, but sometimes switch targets when a player gets affected by XX. This is a regular debuff applied by the boss and has to be healed off by the healer. All adds will fixate onto that player.
Throughout the fight, carts will rush through the arena over the traintracks. These are indicated by glowing up. This will deal heavy damage to players struck, but kill all adds that were hit.
Players that are fixated by the adds need to aim them into the charge, or through the cart rushing in.
The boss also spawns some swirls below each player after his charge, which also kills these adds.
And in Mythic, sometimes a cart is driving in that has dynamite loaded on it. This has to be killed within 20 seconds or it explodes for deadly damage.