Forum talk:Neekerivittu/@comment-4636093-20130929025937/@comment-13160526-20130929150733

I was wondering it too when i first bought him (Release lel.).

Basically his ultimate calculates not the damage you have dealt when you see numbers, but the damage dealt BEFORE armor\magic resist mitigation, in other words it's like the ult calculates all the damage you are about to do as if it was true damage so no reduced from armor\mr, then it reduces the detonation damage by the enemy armor and your armor pen.

This is why his ult does so much damage.

I've read it somewhere on wikia here, ability details section.

Also, when you ult, Zed automatically performs an autoattack unless you interrupt it of course, making ult registering alot of damage for the detonation part.