Lady Anacondra

Entrance cavern
Pass the Disciple of Naralex at the entrance and clear into the first large cavern. Find Lady Anacondra before committing to either branch. Defeat nearby Druid of the Fang pulls separately where possible so their slumber and healing casts do not overlap Anacondra's Sleep.

Lady Anacondra
<Fanglord>Elite HumanoidAnacondra combines Sleep and Healing Touch with Thorns Aura, so stopping casts must not distract the healer from melee retaliation damage.
Abilities

Sleep
Puts the enemy target to sleep for up to 20 seconds. Any damage caused will awaken the target. Only one target can be asleep at a time.
Interrupt Sleep before it disables the healer or an interrupt user; remove the magical sleep if it lands.

Healing Touch
Stop Healing Touch with a separate interrupt when possible, preserving the player assigned to Sleep.

Lightning Bolt
Blasts an enemy with lightning, inflicting Nature damage.
Interrupt Lightning Bolt after Sleep and Healing Touch have coverage to reduce Nature damage on its target.

Thorns Aura
Melee hits cause Nature retaliation. Include melee attackers in healing rather than watching the tank alone.
Tank- Keep Anacondra separate from nearby Druids of the Fang so Druid's Slumber does not overlap the boss's Sleep. Use spare interrupts on Lightning Bolt while the assigned players cover Sleep and Healing Touch.
Healer- Watch melee attackers for Thorns Aura damage alongside the tank. Clear Sleep from another healer or the assigned interrupt user when your spells allow it.
Damage- Give Sleep and Healing Touch different interrupt assignments. Melee attackers should watch their health under Thorns Aura instead of assuming every hit only hurts Anacondra.