Volcanic Rock Spear is the signature technique of Naoya Takamura that was created on an accident with some assistant from Son Gokū who was being uncharacteristically helpful for once.
Description[]
The user flows lava release chakra through all or parts of their body, causing it to become noticeably darker and glowing red and orange lines begin to form like veins of magma flowing across the body. Along increasing the users defensive power to become much harder and durable it also has the power to burn those the user makes contact with due to the nature of the body now being like molten rock. It grants the user greater resistance to damage with the exception of Lightning Release ninjutsu.
Naoya's Current Version[]
The first time Naoya used the technique unconsciously as Son Goku was attempting to protect his host, but upon following attempt at using the technique himself Naoya found himself unable to fully activate the jutsu. This was due to he youth and inexperience in both jutsu and accessing the abilities granted as a jinchuriki of the 4 Tails he is only able to produce the jutsu's affect upon a single arm at a time.
Weakness[]
The one main weakness of the technique is water release ninjutsu as the water can counter the technique by cooling the molten chakra skin leaving it as nothing but a hardened body almost completely removing it primary offensive capability.