reservation
Herald of Agony is a herald skill gem. When activated it reserves mana and grants a buff that gives a chance to inflict poison on enemies. Whenever the user poisons an enemy, it grants Virulence and summons an Agony Crawler minion, which becomes stronger with more stacks of Virulence.
A chaos herald that empowers poison and grants a stacking buff on kills.
Level requirement: 16.
Checked by hand against the game, one Style at a time.