Based on [this discussion](https://www.reddit.com/r/leagueoflegends/comments/9ws6bs/ap_bruisers_who_they_are_and_what_they_need/), I came up with an idea for an AP bruiser item. This item functions as a first rush item on champions when you want to build them as an AP bruiser. This could be useful on Mordekaiser, Diana, AP Jax, AP tanks such as Maokai or even Leona, to name a few.
Builds from: Aether Wisp + Kindlegem + Dagger + Dagger + 1000g (3250g total)
* 50 Ability Power
* 30% Attack Speed
* 350 Health
* 10% Cooldown Reduction
* 7% Movement Speed
* Unique - Echo: Gain charges on attacking enemy champions, max 100 (34 charges per attack). At 100 charges, the next damaging spell hit expends all charges to deal 25-150 (based on level) (+10% AP) bonus magic damage to up to 4 targets on hit.
(95% gold efficient without passive)
I think this would be great on auto-attacking melee AP champions. I think it also *doesn't* work very well on most possible abuse cases (that I can think of) such as AP assassins, because they don't auto attack enough.
It has a good build path and the passive scales with levels so it's not too oppressive early game.