In the end, every house of the 12 that fight in the Steel Arena ended up asking Tuf for a new beast to fight in the arena. Every house asking for a beast got overpowered by the next house and their new beast.
Tuf gave each house a specific prey so the predator could thrive in the wild and thus, continue breeding for the house's benefit.
What Tuf failed to mention was that due to the natural resources of Lyronica and the differences between this planet and the introduced species' home planet would eventually end up killing the predators and for the preys, it would be very different.
What Tuf did in the end was secure that every aggresive species bought by the 12 houses would end up dying and, the preys would end up modifying the environment and obstructing Lyronica's inhabitants to continue their way of living.
Tuf ended up killing the beast fights for good, and Lyronica would end up thriving as a peaceful planet with no behaviour worthy of cavemen.
And he ended up charging each house for this bio engineering services that, despite not being asked for, it was much needed.
