I tested this in a game against minions (0 armor 0 mres).
I had 23 AP and Arcane Blade mastery, no Nashor's Tooth: just sated devourer.
When I autoattacked a minion with the sated devourer ghost and my E being activated, I dealt 130+66 magic damage, **for a total of 196**.
On the other hand while I had my E deactivated I dealt 97+100 magic damage, for a total of **197** magic damage.
How is it possible that I deal more damage while my E is deactivated?
Kayle's E when not active deals 10/15/20/25/30 + 15% AP bonus magic damage ONHIT.
Kayle's E when active deals 20/30/40/50/60 + 25% AP bonus magic damage ONHIT.
Why does my ghost deal 66 bonus magic damage when all my on-hit effects deal 130 magic damage?
It doesn't make much sense ;_;
EDIT: 6/30 PBE PATCH UPDATE: STILL BUGGED.
EDIT: 7/2 PBE PATCH UPDATE: FIXED :D