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The damage depends on the number of creatures killed by the target stack. That is, the more enemies it hits, the more damage it will deal. I haven't checked how it works with Seraphs, but in Zehir's last mission with spellcasting at level 35, I dealt about 8400 damage. I was almost stunned myself.
Does anyone know if Divine Retribution is affected by the Lucky Charm skill, or is this ability only for Chaos?