Detect Chaos

Player's Handbook v.3.5 (PH)Core (3.5)
School
Divination
Casting Time
1 standard action
Components
V, S, DF
Range
60 ft.
Duration
Concentration, up to 10 minutes/ level (D)
Saving Throw
None
Spell Resistance
No

This spell functions like detect evil, except that it detects the auras of chaotic creatures, clerics of chaotic deities, chaotic spells, and chaotic magic items, and you are vulnerable to an overwhelming chaotic aura if you are lawful.