Just a random thought : Flying Incorporeal Undead with Flyby Attack feat?

[Shin Okada]

Do you think it is reasonable to let a Flying Incorporeal Undead (like Wraith or Spectre) with Flyby Attack feat to emerge from a wall, attack, then go back to wall in a single turn?

Or is it not possible to use Flyby Attack in this way as a Wraith in a wall cannot decide the target of attack?

 

[Artoomis]

I think it's fine.

Spring Attack is a better option, though. No AoO.