Hericius

Raid - Comet of Ahnket

Mechanics

Interrupt Chlorolance to prevent a threat reset. If it lands, the target cannot generate aggro.
Interrupt Cleansing Siphon.
On engage, three colored mushrooms spawn on the edges. Lightly hit to gain protection: Blue shows blue wave lanes and protects from Acidic Spores; Green protects from Caustic Spores; Orange shows red lanes and protects from Incendiary Spores.
Do not kill any mushroom before Shroommageddon. Killing one causes the boss to enrage. Avoid cleave near mushrooms.
Every four mushroom phases, Hericius casts Call for Help. Three adds spawn: Lifewrought heals, Soothseer deals AoE, Sentinel hits hard. CC them and kill quickly. Each add heals its matching mushroom on death.
After Call for Help, wave lanes sweep the arena. Use red and blue mushroom buffs to reveal lanes and move the raid to safe spots.
At 10 percent, Shroommageddon starts. The three mushrooms heal to full. You have about 25 seconds to kill all three. Split DPS evenly. Wave lanes stop during this phase.