This allows offensive powers to work against SD rather than other defenses.  All Supernaturally Based attacks must be STUN only.  This costs +1.   It is only an additional +1/2 for no range modifier and based on ECV.

A character may use a Supernaturally Based attack that is not STUN only, but is instead a normal attack with BOD damage. This costs an additional +1/2 (same advantage for the basic Supernatural Attack power).

A character may make a Killing Attack based on supernatural abilities for an additional +1 1/2, for a total of +3.