Prof Bonus +4, Dex +4, Archery +2 xbow +1, = +11
As for hiting. He pretty much always attacks with advantage .. either via 1st to go in round.. what with +9 initiative or by faerie fire (via a druid in party).
Dmg per round 1d6 +15 (+4 dex, +1 xbow, +10 SS)
1/rd SA +2d6
plus 3d6 via Hex (he is...