Vashnik is a single phase boss with rotating abilities. By default, he only has one ability that requires targeted players to step out of the group to avoid hitting anyone, but he gains new abilities based off the altars he uses.
Every time he reaches full energy, Vashnik will Imbibe from the two closest altars. He will spawn slimes from these altars, gain a stack of constant raid damage, and gain a new ability until the next round.
The fight will start between the Fire and Shadow altar, standing close to the shadow one. After the first adds are down, he will be moved to the Blood and Fire section, close to the middle. After the Imbibe, grip or knock back the fire adds to the tanks and then move to the blood altar. The final round of Imbibe will have most of the group stay on the blood add while two quick dps run over to kill the shadow adds. Repeat until dead.
Shadow
The slimes from the shadow altar come in a group and have a shield. They are immune to cc until the shield is broken, but are not very durable.
The ability from the shadow venom puts a healing absorb and dot on random players. Until the absorb is healed through, the player will continuously explode with void zones.
Fire
Fire slimes come in pairs, but can be gripped and moved. Tanks should not wait next to the fire altar unless the group is completely devoid of dk’s to grip the adds.
Fire venom explodes when dispelled, so removing it should be staggered.
Blood
The blood slime starts as a big add, but splits into two smaller adds every time it dies. The medium sized slimes will split once more for a total of 4 small slimes.
Blood venom puts a large healing absorb on a target that can only be healed by draining health from allies. Everyone that can should stack on the target to remove the dot as soon as possible.