Going from curse to Corpse + Curse. 60% to 45% Fire resist Is going from 40% damage to 55% Damage, this is a 37.5% Increase in Damage.
Pure Mage with Curse & 125 int (30% sdi) - 35 Damage Explosion, 42 Damage Flamestrike, 35 Damage AI
Scribe Mage With Curse & 125 int - 37 Damage explosion, 45 Damage, 35 Damage AI
After Corpse addition
48 Damage Explosion, 57 Damage Flamestrike, 35 Damage AI
Not Factoring if it were a scribe mage.
51 Damage Explosion, 61 Damage Flamestrike, 35 Damage AI
Time to Cast Corpseskin
~ 1.2 Seconds Depending on Connection.
1.2 Seconds to Increase the damage by 28 on the first example, 30 Damage increase on the second one.
Not Factoring the increase to Supernova and conflags, Also 37.5% More damage. As opposed to a just cursed target.
But this doesn't just effect mages. THIS pushes other attacks beyond armor ignore. 100 Tactics, 100 Anatomy, 100 damage increase, 100% Poison Crossbow hitting for 36-45 Damage base hits + Concussion. Not factoring evil omen or hit spell.
You Wouldn't EVEN have to do a special after the combo with the right weapon to hit as hard if not harder than an armor ignore.