Stalhrim Longsword of Flame is a unique longsword that inflicts Fire Damage while simultaneously increasing an opponent's susceptibility to fire. This one-handed weapon can be obtained as a main quest reward.
Enchantment ID: BM_icefire
Korst Wind-Eye requests that the Nerevarine investigate the slaughter of horkers at Castle Karstaag to determine if it is a sign an impending Bloodmoon Prophecy. Upon returning the Nerevarine is rewarded with this sword.