0_o i dont even remember having a problem with them.. ignore the negator and DONT use your aeons and it will make it alot easier (IMO at least since thats the way i did it) then simply whack away at the crawler till it dies since mana beam is negated by the negator (thanks bud) rikku's albhed potions help quite a bit use em. try to remember that aeons are relatively speaking... SLOW. your characters have skills like reflex and cheer. use them :P