Talk:Zac/@comment-24191440-20150504183159/@comment-5211662-20150506032340

I wouldn't buy Rabadon on Zac. Not only Rabadon is only effective when you are stacking AP, but also Zac has very poor AP ratios; thus he isn't going to get much from building raw AP. Zhonya is OK because of the armor and the active, and is actually quite good if there is a Zed on the enemy team; but generally Zac benefits more from other items.

If you want an offensive item on Zac, your best bet is Liandry's Torment. Buy a Haunting Guise early, and when combined with Sorcerer's Shoes, this allows Zac to have a lot of magic penetration, which is good against enemies that don't stack magic resistance. Unfortunately, other top laners are probably going to build magic resistance against you, negating the effectiveness of this strategy. Liandry's Torment is still, however, an amazing late game item for Zac.

Other good items: Abyssal Scepter (good against APs, reduces their magic resistance) and Rylai's Crystal Scepter (more slows). Apart from those items, though, I would not recommend to buy AP. Just buy tanky items, as Zac is a tank and is melee, and he has more synergy with tank items.