It's not that creatures and monsters never existed, it's that they've been scrubbed away from history. Now known as Variants, there are people working to continue their concealment from humanity... and others wanting to eradicate them completely.
Need to rework this story/world. Was based on an old RP that I can't recall anymore. "Spliced" are humans that were directly or are descended from someone that was genetically modified. Certain traits are accepted, while others are shunned.