SiigonisBiiKriid (Argonian Blue Slayer) is a custom argonian follower that lives in Riverwood. He works at the mill and "sleeps" he actually just stands for now, in the Sleeping Giant Inn. He is a master archer that can train the player in archery for a cost. Siigonis' max level is 100 making him extremely powerful as your player levels up. I have seen him have the level 100 sneak invisibility perk.