Quagmirran is the third and final boss of The Slave Pens. He is a Fungal Giant players encounter after freeing Naturalist Bite from his prison near him.
Abilities
Acid Geyser: Quagmirran selects one random party member and initiates a channeled cone area of effect (AoE) nature damage attack in the direction of that party member. During the Acid Geyser, the tank may Taunt Quagmirran to force the boss to focus the attack on him for the duration of the taunt debuff, but Quagmirran will turn back to his original target when the debuff ends if the Acid Geyser timer has not yet finished. This attack also has an aggro reducing component. What this means for the tank: you should tank him facing away from the rest of the group as you would most dragons. Be prepared to taunt during the Acid Geyser to force him to face you. Spell Reflection can also be used in conjunction with the taunt to mitigate damage.
Poison Bolt Volley: Standard AoE poison bolt volley hitting for 2,500 nature damage with added dispellable damage over time (DoT).
Strategy
Prior to engaging this boss, remember to unlock and free Naturalist Bite in the cage in the room you are in. When you free him, mobs will spawn. Be prepared! After freeing him you can talk to him and he will buff you with a 30 minute Mark of Bite buff which grants you 110 Nature Resistance and +5% to all stats. This will help with the Poison DoT and his AoE as they both are Nature based.
Nature resist totems/auras stack with the Mark of Bite buff and should be used if available. Hunters turn on Aspect of the Wild, Shamans drop Nature Resistance Totem.
The fight is primarily a tank and spank fight, with healers concentrating on healing the tank and cleansing the DoT from the Poison Bolt Volley.