A creature's prey are the creatures that it hunts and eats in order to live.

A creature that preys on other creatures lives by catching and eating them.

You can refer to the people who someone tries to harm or trick as their prey .

If someone preys on other people, especially people who are unable to protect themselves, they take advantage of them or harm them in some way.

If something preys on your mind, you cannot stop thinking and worrying about it.

If someone is prey to something bad, they have a tendency to let themselves be affected by it.

To fall prey to something bad means to be taken over or affected by it.