Know Alignment {Priest}

A know alignment spell enables the priest to exactly read the aura of a creature or an aligned object (unaligned objects reveal nothing). The caster must remain stationary and concentrate on the subject for a full round. If the creature rolls a successful saving throw vs. spell, the caster learns nothing about that particular creature from the casting. Certain magical devices negate the power of the know alignment spell.

Reverse: Undetectable Alignment

The reverse, undetectable alignment, conceals the alignment of an object or creature for 24 hours.

[Player's Handbook]

Reversible

Sphere: Divination
(Divination)
Level: 2

Range: 10 yards
Components: V, S
Duration: 1 turn
Casting time: 1 round
Area of Effect: 1 creature or object
Saving Throw: Negates