Okay, I know who this is. He lives in a cave near the end of the Peckett's Patrol quest. Actually two live in there.
They can be various levels, and they are tough as named mobs - the lvl 14 to 15ish ones are.
They have a funny feature. If someone tries to kill one in its cave, and if they run - the rotpaw will chase the pc - and when at last the pc either dies or outdistances - the rotpaw will stop ... and will not go back to his cave.
So he can be stuck out in antonica out of his cave for a while. Then someone else comes along - wham - they run to the big sword hoping the guards will help them. They die or whatever, and now this guy is stuck near the big claymore.
Do Pecketts Patrol- click box in lighthouse. Then u will find the cave (near the end of the quest). It's really cool. If you are high enough (mid teens) and know how to sprint in case a big one is in there - go in and look. They are making... well, I'll let you go see. I love this cave and wish there was a lot more content like this- and i wish the quest involving it weren't so stinkin rare! GL all!