settings: modern day America and an imaginary kingdom
googled term: mermaids, mermaid myth, mermaid mythology, killing mermaids
I'm needing your help for a script I'm writing. In the plot, the main character accidentally jumps between this world and another otherworldly sphere inhabited by scary cannibalistic mermaid-like creatures who have to feed on humans to stay young. Although the characters aren't exactly mermaids (which means I have lots of room to get creative aka make stuff up), I've based a lot of their traits on Japanese mermaid and Celtic faerie myths.
I need to know if there's any specific way to kill a mermaid, like silver bullets killing werewolves. It can be from any culture's incarnation of a mermaid or a similar sea monster. Thanks!