What would happen if there was an AP "The Black Cleaver"?
Something like this:
The Black Spellbook
- +300 health
- +80 AP
- +20% cooldown reduction
UNIQUE: Dealing magic damage to an enemy champion Curses them, reducing their magic resistance by 5% for 6 seconds, stacking up to 6 times for a maximum of 30%.
UNIQUE - RAGE: Dealing magic damage grants 20 movement speed for 2 seconds. Assists on Cursed enemy champions or kills on any unit grant 60 movement speed for 2 seconds instead. This movement speed bonus is halved for ranged champions.
Recipe: Fiendish Codex + Blasting Wand + Ruby Crystal (for a combine cost of 950)
The above example is just an hypothetical example of a possible magic damage counterpart to The Black Cleaver. It is not meant to be a suggestion.
Anyone who builds


grants total 35% magic pen frontloaded. even with the extra stats, the bursty nature of mages makes void staff superior in every way.
I think.
in the sense that it is an item meant to give you protection against magic damage while still giving you offensive stats. They don't share a lot of similarity other than that and having magic resistance, though.
, since although he benefits from CDR, he has a hard time itemizing for it, since he is a tanky, manaless champion that does magic damage and has no AD ratios. This means that stacking CDR for him is hard without the help of runes. Such an item would benefit him for that reason; while also giving him magic resistance reduction (Zac loves magic penetration/reduction but most of time he can't itemize for that either)

properly without worrying about those champions getting gutted in the process.
would buy both of them :)
and