Shadowstone

This is a heavy mace +2 which raises your effective caster level with the descriptor 'shadow' in one.Give him effects of scarab of protection,against the first two energy-draining attacks he suffers each day. Finally, any creature struck by the weapon must succeed on a DC 16 Fortitude save or be targeted by a blindness effect for 1d4 rounds. Strong abjuration and necromancy; CL 20th; Weight 8 lb.

sidebar pg 115-Champion of Ruin sourcebook.