Mental Mirror (3.5e Spell)

After casting this spell, the first hostile mind-affecting spell to directly target you rebounds back onto the caster without affecting you. If there would have been a save against the spell, the caster is allowed a save at the same DC to avoid being affected by his own spell. On a successful save the caster suffers no ill effects, even if the rebounded spell would normally cause negative effects on a successful save. Once a hostile spell has rebounded, this spell is discharged. Multiple castings of this spell on the same creature do not stack.

Focus: a small shard of mirror with the symbol of an eye inscribed on it, bound in lead.