Undetectable Alignment

[Paseo H]

Example: Using Detect Evil on a person who is under the effect of the spell, and is evil.

Would the person using Detect Evil realize that they were tripped up by this spell

[Curmudgeon]

You generally have no clue that magic affects you other than when the spell has obvious effects (Fireball and the like) and when you make a successful saving throw to resist a spell. So no character would know they were in the area of a Detect Evil spell unless they noticed the verbal and somatic components of the spell and succeeded on their Spellcraft check. Similarly, a caster of Detect Evil would have no clue that an evil character was under an Undetectable Alignment spell; they simply would detect no evil.

[Paseo H]

okay, thanks.