The powers of hell offer you solace, at the potential cost of your own vitality.

Encounter   ✦     Arcane
No Action      Personal

Trigger: You fail a saving throw

Effect: Reroll the save with a bonus equal to your Charisma or Intelligence modifier. If the new save fails, lose a healing surge (or hit points equal to your surge value, if you don't have any healing surges left).

Published in Player's Handbook Races: Tiefling, page(s) 12.