This matte black crystal seems to absorb any ambient light, rather than reflect or refract it.

You can activate a third eye dampening to reduce all variable numeric effects of the next power, psi-like ability, spell, or spell-like ability that affects you to the minimum value (if this power or spell would affect multiple creatures, only you are protected). This protection lasts until the end of your next turn. This ability functions once per day.

Prerequisites: Craft Wondrous Item, dispel magic or damp power (CP 82).
Cost to Create: 1,000 gp (plus 500 gp for base item), 80 XP, 2 days.