Lately I was playing a game that was heavy on a sort of whitchcraft, to enhance creatures either by chirurgical (frankensteinish) or magical means which alter their body (and at times also magical abilities). The player did not have such ability, but faced a lot of enemies which were either "enhanced" humans (often not-so-happy with their new forms) and at times chimeras, which were assembled from several species.
Looking at OpenDungeons again, I began wondering if it could be a interesting twist to the gameplay - insted of attracting creatures, a keeper could also breed creatures, or order some medical/magical minions of his, to create chimeras from other minions of his.
Chimeras could be more powerful and very loyal (made, so that they must obey at all cost), but the drawback is, fewer creatures will join, because some might be anxious also to be dissected and reassembled. So a keeper must balance the frequency of creating chimeras to gain more powerul minions with the number of new creatures they need.
Breeding creatures on the other hand might just be a resource sink, and not scare the rest of the minions. But unlike chimeras which gain the abilities of the used species in their construction, breeding creature will be random, and some breeds might unusable, others even harmful, to make it more of a gambling activity for the player (resources as input -> luck -> good or bad breed as result).