Fire Starter is a magical Longsword, it burns on command and deals fire damage when burning.
When burning, on a crit it deal extra 1d6 fire damage
The sword was broken into 2 pieces a long time ago, the hilt was found by the Zhentarim and was left behind when they left their sewer base after the attack of the Otyugh that decided to inhabit the sewer.
The blade was hidden by a Kenny in The Forsaken Chambers
The hilt was found by the Boulder Team and Perrin Broadhill took hit into her possesion.
Tannis holds the blade, found in room 7 in The Forsaken Chambers
The sword was shuttered to pieces by an earthmaw trap in room 37 of The Forsaken Chambers.