Sephek was a charismatic caravan guard who used his position as a traveller as an opportunity to commit murders of retribution for Auril.
He targeted Ten Towners who had attempted to escape the unforgiving lotteries of Brynn Shander, Targos and Easthaven.
He was eventually undone when he grew impatient and pre-emptively targeted a priest of Oghma from Termalaine. His exact nature was unknown but when he was slain he crumbled into shards of ice.