User blog comment:Myself v1.0/AP on-hitters/@comment-6000413-20140214121749

No one seems to consider another aspect of ap on hit: Hurricane.

If you want to deal sustained damage, AD is the best way. Always. Even with high ap ratios like kyle+nashor+spellblade, you get to 60% ap on hit. That's as efficient as buying straight ad, with the difference that AD can crit and lifesteal.

So you can have 2 reasons to build AP on hit (I'm not considering Lich bane, that merely adds to burst most times, unless you have some really low cd spell):

- To deal good damage AFTER your burst -> AP usually gives a good burst, so, since you already build ap, why not to buy a nashor to fill the gap between abilities, especially if you have some on hit effects (Ori, teemo, Kayle...)?

- To deal AOE sustained damage through Hurricane -> since your effects are on-hit they are fully applied to the secondary bolts, so nearly 100% of your damage is applied to secondary targets. Sure, you won't have the same single target damage as an ADC, but you spam huge damage on the whole enemy team.

Kayle, teemo, ori and similar can use hurricane to destroy the entire enemy team, not just one champ at a time, albeit sacrificing some initial burst and single target damage.

So: Runaan's Hurricane is a bad item on nearly every champion. BUT it is great for AP on-hitters that manage to survive a few secs in the fray, destroying 3 champs at a time