I would love an arena pen. You can place a fighter vs fighter, pet vs pet, fighter vs pet. And they aggro automatically to fight to the death. And maybe even player vs pet, player vs thrall. For sparring and training. How awesome would that be. And it can be unlocked to allow anyone to place/enter for combat purposes. Only 1 v1, but maybe a T2 and T3, 2 v 2 and 3 v 3 respectively.
Make it so you can hit a spwn point, and it locks it to that player for 30 minutes. Thus you can’t be hijacked or ganked while sparring.
2 slots for the pets/thralls, and 1 spawn point air locked.
If you place 2 pets./thralls in it, they will be in the arena, and fight til death.
If you place 1 thrall/pet, and hit spawn point, door opens and you can enter to fight.
If you die, you re-spawn at the gate airlock and can reenter, or exit. you have 30 minutes per visit, and 30 minute cool off.
Maybe this is how you can level thralls/pets up over time without taking them out to fight. Very Conan movie-esque