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Calaglin, Former Illusionist/Guild Leader of Dissolution on Nektulos
Calaglin, Former Illusionist/Guild Leader of Confirmed on Unrest
Sum up all the ticks it does, that's it's base damage. It can get as much as 50% of that in spell mod. That means that in your figure, it would do 1000 over time + 300 in the first tick, added to the base tick.
The only pieces worth keeping to make up that 4 set would be boots, forearms, robe and pants. Do I recommend it? meh I think there are some better options out there, however 2 set def worth keeping until then.