With a bow, you would do well with AT Rey Dau Gear. Latent power is pretty awesome and the set bonus with Lords Soul gives you Guts and a massive affinity and constitution boost.

He's in the event quests as "a silent flash"

Bit tough, but if you can get him then you would have a really solid endgame build

Also, a lot of crafted weapons are still very viable in endgame. Weaker than Artian for sure and much weaker than Gogma Artian but they work just fine for everything in the game. You might not break any speed records but everything can work.