Jagged Abrasion (TANK)
Applies a stacking DoT to the tank, dealing 1.2 million physical every 2 seconds for 30 seconds. Swap at 4.
Unchecked Rage (TANK)
When Harjatan reaches 100 energy, he does 69.8 million physical split between everyone in a frontal cone. Does an additional 6.2 million to the current tank. Enrages if he doesn't hit 5 people. Tank needs to have the boss faced towards the raid before this goes off.
Spoiler: Unchecked RageShow
Roars and causes 3 murlocs to join the fight. Additional murloc at 66% and 33%.
Spoiler: Commanding RoarShow
Various mechanics throughout the encounter cause this stacking debuff, which deals 250,000 frost every 2 seconds and increases frost damage taken by 5%.
These are pools of water that are left on the ground through a couple mechanics. Standing in them deals 202,500 frost every second and applies a stack of Drenched. The general idea is to drop these on the sides of the room, leaving an area clear for when the pools get pulled in.
Spoiler: Drenching WatersShow
This murloc takes top priority.
- Watery Splash
Splashes random targets, dealing 1.9 frost and applying a stack of Drenched. Supposedly interruptible, but not verified by the journal.
- Aqueous Burst
Puts a watery circle under random players. After 6 seconds, they explode, dealing 1.2 million frost to anyone within the circle and dropping a pool of Drenching Waters. These need to be brought to the sides of the room and dropped as close to other Drenching Water pools as possible to conserve space.
Spoiler: Aqueous BurstShow
In the PTR videos this murloc seemed like a non-factor.
- Splasy Cleave
Deals 1 million frost and applies a stack of Drenched to everyone in a frontal cone. Tanks face away from raid while they still have aggro.
- Dripping Blade
Melee attacks apply a stack of Drenched.
- Driven Assault
Fixates on a random target and chases after them. Increases their physical damage done by 50%, but lowers their movement speed by 35%.
Based on the dungeon journal this add seems to have been taken out of the fight.
Draw In / Frigid Blows / Drenching Slough
Harjatan draws in and absorbs all of the Drenching Waters pools, giving him a stack of Frigid Blows per pool absorbed. This buff causes each of his melee attacks to deal 725,270 frost to the raid.
Each melee attack also causes Drenching Slough, which is basically an ice projectile aimed at a random player's location, which deals 1.3 million frost if hit and leaves behind a pool of Drenching Waters. The idea is for all players to get to the sides of the room immediately after he sucks the pools to bait Drenching Waters into good locations.
Spoiler: Draw In / Frigid BlowsShow
After Frigid Blows, Harjatan deals 239,926 frost to everyone and then removes their Drenched stacks.