I played one character that would have been able to deal with 30 5-th level paladins, but she made it to 40th level before the DM retired her and made her part of the pantheon. Once she was 17th it would have been barely doable, do to her having taken silent spell, still spell, and eschew materials, but once she was 21st level she'd steamroll that many low level characters with a single spell.