The Fire Spear (火炎槍 Kaen Yari) was a weapon used by the Liberation Army in order to defeat Teo McDohl's Armoured Cavalry. The plans, purchased from the dwarves, were smuggled by Odessa Silverberg to the Secret Factory via a fellow ninja, Kage, and became a lifesaver for the Liberation Army upon their delivery to the castle, successfully allowing them to drive off Teo McDohl's soldiers, who beforehand had handed them a humiliating defeat.
Not all the fire spears were used at the end of the Toran Liberation War, and Flik and Viktor took them as they travelled north to the City-States of Jowston, figuring they could come in use. However, it seems that the spears were not well taken care of by Viktor, and had rusted, severely reducing their usefulness. The mercenaries recruited the talented spearman Tsai, who was able to repair them in a single day, giving them a surprise weapon to help ward off Solon Jhee's attack on the Mercenary Fortress. Following this, they were used with great efficiency by Tsai's unit in the Allied Army.