Fiery Soul Trap

The Fiery Soul Trap enchant is a weapon enchant which, just as the name suggests, adds both a Soul Trap- and a Fire Damage-effect. It traps any creatures (or humanoids, if you use Black Soul Gems) soul if killed within 5 seconds after being hit with the weapon. In addition, it also deals 10 fire damage. It has a purple glow effect. It can sometimes be found on weapons at random shopkeepers or as loot, albeit this is very rare. A sure way of getting it is to go to Ironbind Barrow. A steel axe with this enchant sits on the back of the final boss' throne.