>>719931098
There is a bench in the inn if you unlocked it
At this point the only tools you should have available are the knives and the spike trap.
The general concensus on the mothnigger is that it is easiest just to cheese him by dragging him away from his arena to here and just cheating like a bastard. You can also get Bug Quixote to help after moorwing kills you at least once. You can also completely bypass this fight by collecting five fleas and completing the quest. If you do the flea carvan will move to Moorwing's arena and prevent you from having to fight it.
