>>545505471
Outsider's kit is kind of stupid. You either build Ult or his dagger spam, because his Q disables his "throw dagger on-hit" passive.
Daggers can only hit one enemy at a time so you need a very fast weapon (like dual swords), while Resolve boosts the shit out of your weapon damage at 1HP but you need a big hitter like Crescent Flurry to deal with mobs.

>>545383608
Outsider, Crescent Flurry, and a shitload of crit%+damage+resolve. Unfortunately still not as good as a loli with a oversized magic sword.

>>545292514
Crescent Flurry is fun, but you can skip it if you don't care about katanas. I haven't tested the other two yet.
If your priority is Psyche, just get more copies of her weapon.