Talk:Kenkou Cross Q&A/@comment-24664052-20140906040831/@comment-12776-20140906064714

Simple, they exist alongside other creatures, but never be dominate specie like they were in our world. Just like how there's no era of birds, yet so many birds exist in our world.

T-Rex is just one of common monsters (strong, but still not outlandish) in RPG, no need to bring in anything unusual.