Come to the North Eastern Wilderness at x=1355 z=-2223 to battle a boss! I am being held in my house, and cannot return to spawn. Please let me know if you are willing to help. Make sure you bring a high-powered bow as it is a flying boss.
On a slightly related note, I killed my first Momentus this week wearing a set of leather voter's armor (minus the chestpiece) and a starter sword. Momentus, has been sighted and killed near my farm multiple times. He seems to be attracted to it.