Crothian said:My players are pulling a con and they are investigating ideas to stop True Seeing. One of the characters is a Changeling so he fears being outed. Any ideas?
The warded creature or object becomes difficult to detect by divination spells such as clairaudience/clairvoyance, locate object, and detect spells. Nondetection also prevents location by such magic items as crystal balls. If a divination is attempted against the warded creature or item, the caster of the divination must succeed on a caster level check (1d20 + caster level) against a DC of 11 + the caster level of the spellcaster who cast nondetection. If you cast nondetection on yourself or on an item currently in your possession, the DC is 15 + your caster level.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.