I need a Nocturne AP build that is viable...
And the core component of it needs to be Frost Queen's Acclaim
. I need spooky ghosts to go with my spooky ghost Nocturne skin [zombie-nunu-hearts]
And the core component of it needs to be Frost Queen's Acclaim
. I need spooky ghosts to go with my spooky ghost Nocturne skin [zombie-nunu-hearts]

First we would have to make nocturne viable.
First we would have to make nocturne viable.
His fear has a 1.0 AP ratio. That's enough to work with

He doesn't scale from AP. Only his E scales.
He doesn't scale from AP. Only his E scales.
More than enough!
Yes. It's happening.
PBE buff:
"Nocturne Umbra Blades (Passive) now has a .5 AP ratio."
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I'm thinking Spooky Ghosts, Nashors, Lich Bane, Protobelt, Rabadon's and boots or Luden's next patch
That works, but a big part of Noct is his ability to either instapop a squishy or tank damage while doing nocturne things. This build makes that very plausible in a way that yours doesn't.

This should make you not utterly useless, Q + E or Frost Queens/Funblade should mean 2x Burn effect. Lots of slowing, with AP + AD Damage and AP Burst Damage. Nobody can escape you, and at that, hope to chase you.
Your Skill combo should be R>Gunblade>Q>E>AA. With slows, mild burst damage, and good AD damage, you should be able contribute enough for your team to follow up. It's really an assassin's build, but in an extended teamfight you can enter an exit on regular intervals.