Maybe one of the coolest interactions I've seen recently, and one of the few ways to still make spectres decent.

He's using Phantasmal Desecrate with Ashes + Enhance to get 100% quality on the gem, so he can guarantee Flickershade summons, and then Soul's Wick to make them really powerful.

Pretty expensive to build, and kind of annoying to play, since you have to keep resummoning the spectres, but seems to pay off, since you can actually guarantee the right pool of them at least.

His PoB: https://pastebin.com/K53Mvjcs