Just a quick build I've found that destroys everything.
- Gear: Bard gear + multi-hit weapon for massive mana generation.
- Secondary Gear: Ranger gear for rolling. Fast travel + kiting mobs if needed.
Level up a few spells you like, spam to hearts content.
Die because you can't see the telegraphed attacks behind all the spells.
Spamming Lonely Cave:
Same spam in Cave of the Lion: