The Elder Scrolls: Tamriel real

This jeweled helm holds 1d10 diamonds, 2d10 rubies, 3d10 fire opals, and 4d10 opals. Removing a gem destroys it, and the helm loses its magic when all are gone. While wearing it: Cast daylight (opal), fireball (fire opal), prismatic spray (diamond), or wall of fire (ruby) using an action (DC 18); the gem is destroyed on use. If it has at least 1 diamond, undead within 30 ft. take 1d6 radiant damage at the start of their turn. With at least 1 ruby, you gain fire resistance.