|The party first suspected that something was wrong when they realized that the innkeeper was hiring 4 trained warriors to deal with his "little pest control" problem...|
Well this just has to be the common rat. The staple diet of every 1st level adventurer and always a slightly bigger challenge than they expect. They form the main enemy in the first level of Baldur’s Gate: Dark Alliance, and countless other adventures.
Rats swarm all over the sewers and breed themselves faster than a horny tribble. And they have to. They breed infinitely because without them, 1st level adventurers would have to try and fight other monsters, and they would inevitably lose. With adventurers appearing as fast as we can write up character sheets, we need those endless rat supplies.
Rats of the many RPG worlds, I salute you. Your noble sacrifice has brought so many up and coming heroes to that vital second level, marking their first step on the road to glory. I salute you.