I was L-11 when I first encountered the "Killer Bunny" and he simply 1-hitted me. He was a L-22 bunny. Next time he showed up, he was L-23 but I was ready for him at L-13. I was being very careful that I wouldn't trigger him until I was inside the bandit camp, doing that quest helping the New Order soldiers. I first finished the bandit quest by eliminating all the bandits. Next, I positioned myself near the pig pen where the highest concentration of soldiers was. That's when I killed my last bunny and he popped up. I kept jumping over the pig pen fence back and forth until finally 5 soldiers surrounded him and trapped him. The rest was shooting a sitting duck from s distance with my bow. He never did break loose or hurt any of the soldiers. It took me over ten minutes to kill him even with the aid of all those soldiers. According to my combat log, they were doing 15-20 dmg each. I ended up getting only 560 exp out of him but got my achievement at L-13 cheer


I'd like to close by quoting Bellegar's famous last rhyme:

"Cursed be the mother that bred thee!
The wench must have been a hell-spawned banshee!"