What AP do I use for Xenon first?

In terms of skill synergy, LUK is the best option, because every avoid gives you a chance to regenerate one supply (well, every hit, but you DO want to avoid hits no?). When a boss is in DR and your bind is on CD, assuming no pot CD and the boss isn't 1HKO you would keep tanking the boss so that Aegis would keep attacking the boss bypassing DR. Armour and accuracy are pointless stats in Maple so avoid is the best way to go (don't forget that your multilaterals increase Avoid rate too).

Hadriel