Ultiss

Ultiss initially met up with the group while they ventured through the Public Bathhouse and Courtyard on their way to investigate the area for a secret Followers of The Dead Three hide-out.
Not much information is shared between Ultiss and the group, he is a very vague and mysterious character. However, during a brief conversation with Mako it seems that Ultiss may have similar goals in mind - investigate this cult and destroy the evil followers.
He joins the party to fight his way through the secret entrance to the underground dungeon beneath the bathhouse. Still suspicious of their new quiet ally, the group continously pressures Ultiss and forces him to reveal that he is in fact a Tiefling (part demon). He has been disguised as a human to avoid the negative connotations associated with his misunderstood race. 
He continues to journey with the group through the underground dungeon, trying to find answers to what this dark and disturbing cult of the Dead Three is trying to accomplish.