The Blade of Inferno

This Sword was designed by a Dwarvish engineer,
who was experimenting in creating a mobile explosion
device and with this he has created just that, and
much more to boot.
4lb 1D4 Fire Dmg on hit 3D6 Explosion Dmg
(trail or cone 15 ft)
Components: Gas tube, Flint, and Spark
The Gas Tube:
Lighters:
Retractable Blade: