Really strange Bow ( -2 in stance)

hey guys this guy just gave me this bow.. Kinda a strange bow acualy lol

vampirric Long Bow
Peircing Dmage 13-26 req 6 marksmanship
Dmagae+10% While in Stance
Recive Damage -2 (whiel In stance)
life stealing:1
health Regeneration-1

Well id like ot know what the prie for this would be and is this a collector bow? All i know is that i have never seen a bow like this before so yay.... Post price check and your offer if you do want to buy it.. to see it in game contact me at BAD STOMPY ty! have a nice day

It's a quest reward from some quest in Kryta, around the Lion's Arch area I believe.

Yup from Captain Greywind in Ascalon Settlement.