He was a short, dark-bearded human wizard that was simply known to most as "Glasstaff" for his weapon of choice, a magic staff made of crystal. Arno was initially a member of the Lords' Alliance, who was sent to the town of Phandalin to establish constabulary (as the town did not have a powerful authority). Arno broke ties with the Lord's Alliance, and created the Redbrands and taking his infamous moniker, Glasstaff. He then collaborated partner known as Black Spider and as they shared ideas and resources, Glasstaff offers his apprentice to work for Black Spider for a time. Glasstaff was ultimately killed in battle against the same adventurer's that Gundren hired.