Invocation Grade: Lesser
Equivalent Spell Level: 4th
This eldritch essence invocation allows you to change your eldritch blast into a deteriorating blast. Any creature struck by a deteriorating blast must succeed on a Fortitude save or have its damage reduction lowered by 5 for 1 minute. If the target has more than one type of damage reduction, this effect applies to all of them. Multiple uses of this essence don’t stack; instead, the new duration replaces the old one.
Source: Dragon Magic, page 81.