Oryan77
Adventurer
Ok, in more seriousness, this is a monster vs. monster, not a monster vs. PC situation?
Yep, it's a monster vs monster situation where the PCs would gamble and bet on the winner rather than participate in the fight. It's just for flavor, so I don't even need to roll attacks and actually play out a fight. If it is an even CR, I can roll a 50% chance to determine the winner and just quickly describe the fight for effect. I could let the players run each monster and they could fight each other themselves to determine the winner. They may enjoy that. But really, the simpler the better.
Dannyalcatraz mentioned zombies. Mindless undead like that will even work. I'm pretty much just looking for a weird version of a bear vs lion fight. I'm interested in specific monsters to pit against each other. I'm hoping people will come up with suggestions that I would not think of myself.
If any Planescape fans care, this is for the Bear-Baiting Pit in Fortune's Wheel in Sigil.