Source: More Magic of Thassilon, pg(s). 5
A sacrificial spear is a magical shortspear first created in the ancient Thassilonian realm of Bakrakhan. Made of ash wood, these spears have a removable shard of carnelian embedded in the shaft's base. When crushed, this gem releases tremendous heat and fire similar to that of a fireball spell. With a bit more effort, the spear can be triggered to explode upon hitting a target instead of around the person using it. The sacrificial spear does not grant the user any increased protection from heat or fire.