Lee Cronin's The Mummy

The Nasmaranian is the ancient Egyptian demon, an entity so old that the rituals around it were built to contain it, not to summon it. It works like a parasite: it takes a single living host and spreads outward from there, turning a family against itself, which is why it's known as the destroyer of families. The mummy-like wrappings don't work the way they're typically understood — instead, they're a binding seal that imprisons the demon. In the film it's mentioned that it prefers young hosts, which is why the "guard" of the Nasmaranian kidnapped the child. It's implied that it can't truly be killed, but rather transferred from one host to the next once it outgrows its vessel.