Her origins are never fully explained, though she seems to come directly from the Erdtree—a place of power in the Lands Between. This is very similar to the Maiden in Black’s association with the Nexus. Just as the Maiden has a powerful connection to the Old One, it seems Melina has a powerful connection to Marika.
But to hell with all that. What’s important now is that you can see Meldina’s pussy and her beautiful and big breasts