Permanent Emanation

 
Prerequisite(s): Character Level 21+, Spellcraft 25+ ranks, ability to cast the spell to be made permanent
 
Benefit: Designate any one of the character’s spells whose area is an emanation from the character. This spell’s effect is permanent (though the character can dismiss or restart it as a free action). Effects that would normally dispel this spell instead suppress it for 2d4 rounds.
 
Special: This feat may be taken multiple times. Each time, select a different spell to become permanent.
 
Source: Epic Level Handbook