How does spell damage work with DoTs?
They add directly towards the total damage of the spell. For example, let’s say we had a DoT that ticked for 1 damage every second for 10 seconds, with a +dmg coeffcient of 50%. If you pick up an item with +20 damage, that DoT will gain 10 damage over 10 seconds; it will tick 10 times for 2 damage.