For SC's... Gifts from Heaven, Banefire, Drain Life all work well if heavily spammed. For a couple of SCs with no backup, try Stellar Cascades from dozens of mages. Banish to Inferno/Claws of Cocytos must be favourites.
How does poison damage work with a death bless?
Say you've got a death blessed mage casting breath of the dragon.
Would the affliction chance be calculated when the poison is applied or whenever the poisoned units looses hps in the rounds after?