Well “Reed” is the entity that possessed Jaiden But he’s a demonic being that has been around thousands of years preying upon kids In ancient times, he made his physical entity appear to be a leper, so people would stay away from him But if he saw children, he would hobble his way to them and ask them for some bread/something to eat If the child said no, he didn’t bother However, if they did, he would target them Basically preying upon childlike innocence.

Reed is Lament This is just the human form he took prior to inhabiting Jaidens body