Just solo'd the Reaper at lv50 and I'm pretty happy about it.
>Make a Rangda with repel/drain/null for every element
>Teach it firm Stance and Regen 3
>Wear Regen 2 ring from Tae
>Regen deals with almighty damage, immunities deal with the rest
>No room for any skills, so just put on Rush and autoattack him to death
Fuck yeah.