First Referenced:
'I was told that everyone I'd served with in the military died shortly after I left. (Part 4)'
Encountered on the Earth of Teskoy Prison, Tree Ghosts are pale, translucent entities that appear to resemble trees. Little is known of their origin or nature, other than that they do not understand morality in a human sense, or sensations such as pain. They are however curious about it, as implied by The Sword it would appear that they experiment on anyone they capture by inflicting considerable pain.
Traits:
Looks like a tree, but pale and translucent. Capable of moving, and shows traits of intelligence such as curiosity. Considered hostile.