Adrian nods on Serge Renard's theory about githynaki and he replies; "I agree, githyanki can be source of your troubles also as they can indeed travel between astral and our plane with ease. Bad of me not thinking that and I had studied planes majority of my studies as a conjurer! Also they often raid different planes and slave trade or simply soul trading with fiends is profitable business menu. For such foe I can prepare before hand a spell which blocks entirely all teleporting and planar travel, so that our quarry does not escape through either planar or teleporting means.<br/><br/>Also all githyanki are gifted with mind magic, so they can easily create fire in means which go beyond our own knowledge or can simply enter and leave buildings with dimensional door sort of teleportation. Not to mention they are well organized and militaristic planar culture so they could organize months lasting raid and keep the pace up steadily. Of course twenty people per night is quite specific number, so it raises idea that it's the raiders maximum capacity per night."