Monster Sanctuary

You are a young man about to become a Sanctuary Keeper. As such, you have to gather a party of monsters you grow and train. Meanwhile a series of unsettling events worries the experienced Keepers. This is the beginning of a journey to unravel the cause of this mystery.
Monster Sanctuary is the idea of combining monster collecting, turn based combat and metroidvania like exploration. Any monster you encounter can become a part of your own party. Additional monsters provide a lot of tactical options in combat or allow you to overcome certain obstacles to explore new areas.
Every monster has an unique skill tree. This lets you individualize your monster to pursue different strategies. Feeding and equipping your monsters to improve their stats further emphasizes this aspect.