How to obtain
Woundseeker can currently be obtained only through chests.
Woundseeker's ability is Hunter's Pierce which makes your basic attacks ignore Basic Armor against Critically Wounded targets.
Targets are Critically Wounded whenever they are below 25% Health.
Woundseeker also has a secondary ability, Hunter's Blight which makes your basic attacks apply Blight to Critically Wounded targets for 9.5 seconds.
Blight reduces enemy's Healing by 40%.