Hellfire Hex

Paragon Tier
Prerequisite: 11th level, warlock, Warlock’s Curse class feature, infernal pact
Benefit: Whenever you deal Warlock’s Curse damage to a target with a warlock daily attack power, the target takes ongoing 5 fire damage (save ends). If the power already deals ongoing fire damage, instead increase that ongoing damage by 5.

Published in Dragon Magazine 384, page(s) 31.