Prerequisites: Warlock, Warlock's Curse Class feature
Benefit: You can place your Warlock's Curse on a creature that is already affected by another character's Warlock's Curse. In addition, you have combat advantage against any creature affected by more than one Warlock's Curse.[AP:124]
The feat is reviewed as strong if there are multiple warlocks in the party, in the scope of a single monster which can last multiple turns in a battle.