The Lava Spike is a LEGO Ninjago weapon used by Kai. It is a silver, scythe-like weapon with a long, straight blade and an orange lava gem on its head. It is described as a Fire-based weapon that inflicts painful burning sensations on anyone it cuts—worse yet, the wounds heal extremely slowly. A special potion made from rare Ninjago plant extracts is the only known remedy to the damage inflicted by the Lava Spike.
It may be intended to act as a counterpart to Zane's Ice Spike; another silver weapon with a colored gem on the opposite side of a bladed head and an opposite elemental affinity.
This spike has the power of fire in solid form. Cuts will burn and sting like fire for days, and the wounds do not heal easily. It takes a special potion of rare Ninjago plant extracts to soothe the pain and heal the cuts.