Greater Invocation; 6th
This invocation allows you to deliver a targeted greater dispel magic with your touch. You gain 5 temporary hit points for each spell level dispelled by this touch. For example, if you successfully dispel a wall of ice, you gain 20 temporary hit points. These temporary hit points fade after 1 minute and do not stack with other temporary hit points. If you devour a new spell, you can replace the old temporary hit points with the ones gained from the more recent spell, thus resetting the duration. You cannot devour your own invocations.
Source: Complete Arcane