Mermaid spells/potions

Lunasirenis ..altho a beautiful name an 'impossibility' in the 'real world', as someone historically once said ' I will not believe unless I see it with my own eyes and touch with my own hands' You cannot do this/prove this or otherwise in the 'real world' The Astral is a different story altogether....

I dont think there really is a possible way to become any sort of mystical creature through a spell, if you supposedly do.. its probably an illusion from how much you wanted it. the only way you could become one is by some rare chance you were born like it, actually manage to figure that out, and figure out how to access your powers, otherwise were all just normal humans here (and in my view mermaids, vampires, lycans, faeries etc. are just humans that just stepped up and chose different paths in evolution.) but this is al just my opinion, believe what you wish.