Thwart the Traveller

Level: 3
Duration: 1 minute
The air grows thick and heavy, making extradimensional travel impossible.
By speaking this utterance, you prevent any extradimensional travel in the area. This utterance functions as a dimensional lock spell (PH 221) with a caster level equal to your Primal Speaker level, except as noted here. Whenever a creature uses a spell or spell-like ability to attempt to leave, it is briefly surrounded by a blue nimbus and finds—probably to its surprise—that it hasn’t gone anywhere.