Everlasting Affliction

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

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