A group of Marines, embedded in South Asia, embark on patrol of a remote island in search of drug runners. What they end up finding is something much more deadly and demonic than they could ever imagine.

"On patrol of a remote island in search of drug runners, a group of Marines embedded in South Asia end up finding something much more deadly and demonic than they could ever imagine"

So what?

Even though I find the logline interesting, technically it is missing a clear antagonist. If the story would to be set in e.g. Mexico, the island could be a sacred place for indians. In that case the antagonist could be some cacique trying to hinder the operation. - but really many horror movies are missing a clear antagonist.

This is an great idea!