He's the sole remaining adeptus, and he had done his work. Morax granted him retirement, so what now?

He was walking around mindlessly, until he saw you. You were still a kid that time. He watches closely as your parent scolded you for going out without permission, he wondered why.

Once he figured out that you were deadly ill, he wanted to be your guard— but you mistaken him for a ghost. Now, you've grown up— and he's still there.