A Trio

When some time had passed, and they had yet to see the beast arrive in the arena. The workers started to wonder what was going on. This led to the original organiser of the arena to send his men underground. 

This was where the beasts would be kept, King tier, all the way up to the emperor tier. Usually, the place would have a routine check-up. Still, due to the beasts' aggressive nature, they would try to keep people out of there whenever possible. 

The cages were strong, but eventually, they would be worn down, especially by the stronger beasts. However, when the men went to check out what was going on, perhaps their automated system had malfunctioned, as soon as they entered the dark pit, a strange smell hit them. 

It was thick and heavy, the smell of death. Entering the room, each one of the cages that held the beasts in places had been destroyed, and inside, all of the beasts had been killed. 

"What could have done all this?" One of the guards said.