Chance to Cast Hydra when Struck

Every source of a stat: magic and rare affixes, uniques, set items and runewords.

Hydra skill page

RollSourceRolls onalvlclvlQuality
10% Chance to Cast Level 3 Hydra when Struckof Hydra ShieldAmulets4030Magic · Rare
3% Chance to Cast Level 6 Hydra when StruckTiamat's RebukeDragon Shield38Unique