Famine would help Anasil out but you need to be able to plane shift to get to that pocket they are in.  Famine can't do that except to enter dreams and back.  Plane shift isn't one of our Archfiend SLA's either iirc.<br/><br/>A limited wish can duplicate level 5 cleric spells so that will work for you guys.<br/><br/>The BBEG has spell immunity dimensional anchor,  and contingency against dispelling.  GAT will prevent him from  mini teleports around the battle even after he knows it's there he still shuts himself out if he tries to teleport next to methu,  but it won't prevent his escape.