Khimaira is technically an Arcana type monster, which we lack the family for. Although, it'd be kind of interesting if rather than following the previous system of unlocking monsters, it required, say... 30 Behemoth, 30 Scorpion, and 30 Bat. Maybe interesting isn't the right word, but it'd make sense. Sure would be weird to get Magic Pots or Dolls to 60 or whatever and suddenly have Khim.