So here is my wild mind at work and I don't know if it is acceptable. But that is why I am here so everyone can help.
Reading the information on the Merian it tells that the Merian have breed with humans and made human like Merian. It clearly states that you are Merian solely based on the ability to breathe underwater. Is it possible that maybe a Dracnari and a Merian had a child, giving the child the look of a Dracnari except with blue instead of green scales and instead of fire breathing, gave them the ability to breathe underwater? Or am I missing lore where the Merian and the Dracnari hate each other? I mean, if a Dracnari likes to bask on sands be it desert or beach, if one is on the beach a lot then is it not possible since Merian love the water?
And on a note, when doing a description of yourself if you are a Merian, what is too far-fetched that the Universe will just be like "NOPE!" and make you change it?
Any insight would be awesome.