Invisibility Purge

(Player's Handbook v.3.5, page 245, DnD 3.5)

Evocation

Level: ; Cleric 3; Knight of the Chalice 3; Savant 3
Components: V, S
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 min./level (D)

You surround yourself with a sphere of power with a radius of 5 feet per caster level that negates all forms of invisibility. Anything invisible becomes visible while in the area.