Iarno 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 glass. Iarno was initially a member of the Lords' Alliance, who was sent to the town of Phandalin in 1489 DR to establish constabulary (as the town did not have a powerful authority).
Iarno broke ties with the Lords' Alliance and created the Redbrands under the guidance of The Black Spider.
He was killed by The Party during their infiltration of the Redbrand Hideout, and his staff was taken by Low Noon.