Everlasting Affliction

Everlasting Affliction is a tier-6 Warlock talent in the Affliction tree that increases critical strike chance of Corruption, Seed of Corruption and Unstable Affliction. In addition, each time you cast Haunt, Drain Soul, or Drain Life, it has a chance to reset the Corruption counter.

Tips and tactics
I may be necessary to clip and recast Drain Soul while the target is under 25% HP in order to ensure Corruption is properly refreshed.