Seething Hate

Seething Hate is a rare Fleshbeast wandering outside the entrance of either Vordrassil's Heart, Vordrassil's Limb or Vordrassil's Tears.

Negative emotions being given form by the powers of an Old God was a concept later extended upon with the sha.

Drops

 * Abandoned Adventurer's Satchel
 * Ichor-Stained Wraps

Achievement
Seething Hate is a criterion of the achievements:
 * Northern Exposure
 * Frostbitten