A forest version of the Allay. They have a tree growing out of their backs, and they fly around the forest collecting all the saplings that lumberjacks (Minecraft players who are going on a wood spree) can't bother to pick up and replant. (not me!) They bring them back to their hideout and replant them once the lumberjacks are gone. The lumberjacks never stop to wonder how the forest has regrown even though they chopped it all down...