Flameshape Torch

Wondrous item, uncommon
  Not having enough arms to hold a weapon, shield, and torch simultaneously is an issue that has stumped adventurers for years. Priests of the divine might be inclined to use the light cantrip whilst biomancers like Dr. Francis N. Stein grow additional arms in their constant quest for ‘self improvement’. Artificers elect for a more efficient approach: Fire hurts. Weapons hurt. Why not combine the two in this versatile, dungeon-delving tool?
  As a bonus action while holding this torch, a creature can say the word “spark”, causing the torch to instantly light, shedding bright light in a 20-foot radius, and dim light for an additional 20 feet. The torch can be extinguished by conventional means, or by speaking the word “snuff” as a bonus action.
  Flameshape. While a creature holds this lit torch it can, on its turn, speak the word “flameshape” followed by the name of any melee weapon that doesn’t have the finesse or two-handed properties. The flames morph their shape, and the torch assumes the properties of the associated weapon. On a hit, the flameshape torch deals fire damage instead of the weapons’ normal damage type. The shape can change no more than once each turn.