Images:

gw2-pact-avenger-greatswordgw2-pact-avenger-greatsword-2gw2-pact-avenger-greatsword-3

Set:

Slot Item Name Trading Post Preview Code
Greatsword http://db.dulfy.net/item/31152 GW2 TP [&AgGweQAA]

Where to Obtain:

End of personal story reward. Purchased from vendor.