Ancient Stone Keeper

Stonekeeper halls
Take the Obsidian Sentinel side chamber before continuing to Ancient Stone Keeper. Finish the Sentinel's shards before leaving its room, then use the Stone Keeper's chamber as moving space when sand storms appear.

Ancient Stone Keeper
Elite ElementalAncient Stone Keeper tests whether the tank and healer can keep the fight moving around summoned sand storms.
Abilities

Sand Storms
Summons 1 Sand Storm to aid the caster in battle for 30 seconds.
Move the fight away from each summoned storm instead of keeping Ancient Stone Keeper planted beside the healer's casting position.
Tank- Lead Ancient Stone Keeper into clear space as storms reach the melee group, keeping a path that does not carry the boss through the healer.
Healer- Choose another clear casting position before a storm reaches you and keep line of sight to the moving tank instead of finishing casts inside the storm.
Damage- Follow the tank away from each sand storm. Leave the healer a clear position rather than circling the boss back through the space they just moved into.