Ioun Stone Violet Prism

For each charge expended, this ioun stone will absorb one zero, first, second, or third level spell cast (not a scroll, magic item, or anything not emanating directly from the caster) at the user. When all three charges have been expended, the stone becomes lifeless and will no longer function.

The actions of this ioun stone are controlled by the will of the character. If the character chooses not to expend a charge, the spell targeting the character will take effect. Thus the stone will not automatically interfere with beneficial magic, such as healing.

Ioun Stone Violet Prism will not negate multi-target spells. It can only negate spells of 3rd-level or lower that target a single victim.