It's not the best option to clear Pits with for sure.
The normal build is around these lines:
[build prof=n/a shadow=12 curse=9+1+3 soulr=9+3][deadly paradox][shadow form][light of deldrimor][radiation field][suffering][price of failure][signet of corruption][death's charge][/build]
Actually the exact damage spells are pretty much up to debate. Stay tuned for my epic attempt to create a working Death build for it...