The Shadowstaff

This artifact was crafted centuries ago, weaving together the wispy strands of shadow itself into a twisted black staff. The Shadowstaff makes the wielder slightly shadowy and incorporeal, granting him a +4 bonus to AC and Reflex saves (which stacks with any other bonuses). However, in bright light (such as that of the sun, but not a torch) or in absolute darkness, the wielder takes a –2 penalty on all attack rolls, saves, and checks.

The Shadowstaff also has these powers.

• Summon Shadows: Three times per day the staff may summon 2d4 shadows. Immune to turning, they serve the wielder as if called by a Summon Monster V spell cast at 20th level.
• Summon Nightshade: Once per month, the staff can summon a nightcrawler nightshade that serves the wielder as if called by a Summon Monster IX spell cast at 20th level.
• Shadow Form: Three times per day the wielder can become a living shadow, with all the movement powers granted by the Gaseous Form spell.
• Shadow Bolt: Three times per day the staff can project a ray attack that deals 10d6 points of cold damage to a single target. The shadow bolt has a range of 100 feet.