A Mysterious Agent and Illusionist
Glass is an agent of Duke Hammond, sent to Absum to accomplish unspecified tasks. He is a master swordfighter and skilled with illusion magic, which makes him incredibly dangerous one-on-one. He suffers from some mental condition he requires medicine for, without which he becomes confused and lost. The rest of his character is shaded in mystery.
At the time he was encountered by the Arrivals, he had been hunting bandits for Hammond by using himself as a lure, but without his medication his mind became muddled and he could not remember the purpose of his mission.