How to Obtain[]
Drops from the Hydra King.
Fusion[]
Crown of Atlantis + Hydra King's Head + Hydra King's Scales + Hydra King's Heart + Essence of the Hydra King + Fusion Stone = Hydra's Set
Quest[]
Collect the Essence of Diablo, Essence of the Almighty, Essence of the Time, Essence of Lazar, Essence of Thaerion & Essence of the Hydra King. Bring all six essences to the Arena of the Gods and to start the Essence Fight.