Today I was at my outpost, and saw a momentus.Here is how I killed it:I used my mob launcher to take it out to the water. From there I went under it, and pounded it with my smite 4. It couldn't hit me, and when there where to many minions, I logged out and logged in. I had an anvil ready, so I could enderpearl away from it and repair my armor. In all it took me 10 minutes.