Hydrospawn

Hydrospawn is an elite water elemental mini-boss in the East Wing of Dire Maul, in the Shrine of Eldretharr inside a pool.

Adventure Guide
''When the satyr Zevrim Thornhoof sought to control the elementals in Dire Maul, he focused on Hydrospawn, who calmly resided in the pool beneath his altar. As he performed his profane sacrificial rituals, the elemental grew agitated and restless, striking out at Thornhoof's demonic minions. As the years passed, Thornhoof used his victims' energies to whip Hydrospawn into unbridled fury, little by little binding its will to the satyr's commands.''

Oddly, both Arcane Refreshment and An Unwelcome Guest (Dire Maul) say that Hydrospawn does not seem to be native to the area. This hook was never followed up on, and was contradicted by the Dungeon Journal.

Quest items

 * Hydrospawn Essence
 * Ace of Elementals
 * 2-4 Core of Elements

Equipment

 * Tempest Talisman
 * Waterspout Boots
 * Waveslicer
 * Breakwater Legguards
 * Riptide Shoes

Strategy
During the fight, he will summon hydrolings to help him. It's best to ignore these and continue to kill him, as they don't deal too much damage.

Objective of

 * Arcane Refreshment