What's the big deal? It's just a bunch ok Kecleon. (Disclaimer never played mystery dungeon)
Oh boy. Okay.
So basically, Kecleon only appears as a shopkeeper inside dungeons. You can buy and sell him stuff if you have enough money on you. However, you probably won’t, since taking money with you into dungeons is super dangerous.
So instead, you can steal from him. But doing this will continuously spawn super overpowered Kecleons that move multiple times in one turn. Even defeating one is a major feat, and they WILL gang up on you. So the usual course of action is to try and survive as you rush to the exit.
That nosepass… is taking out multiple of them in one move.