is the magic damage from Zekes based off YOUR OWN or YOUR CARRIES magic penetration? In other words whos magic pen matters the most when it comes to 
? Also if your carry crits will it deal more magic damage or is it based off the carries AD? so Attack Damage or the Auto attack which matters more?
Mysticman891 votesI would assume it work like most other items granting on-hit effects (e.g. ardent censer), so since the carry is the one actually doing bonus magic damage, it's their magic pen that matters.
As for crits, unless the on hit effect specifically says it can crit (such as static shivs effect), it likely can't, so the bonus magic damage part of their attack would remain the same I think, although the wording is 50% more damage so I don't know what precisely they're using as the base (so it's possible that while the effect itself is not technically critting, it might be doing more damage due to the basic attack doing more damage due to that critting).
