give classes to monsters. add templates. throw a dracolich bones oracle at them. also traps. i feel people give them a bad rap, but traps can turn an encounter on its head. yea most traps are kinda mundane and boring, but its up to the gm to make them interesting. glitterdust. Blind everybody followed by a black tentacles. Anybody can roll poorly and fail any check. Deafen them (bard is useless unless he's a booty-shaker type bard!)