Earth Release: Earth Spear

The user flows chakra through all parts of their body causing it to become noticeably darker, which increases their defensive power to its utmost limits by making the skin as hard as diamond. Furthermore, the destructive power of physical attacks is increased, making this a great all-purpose technique. The amount of techniques that can break through the areas hardened by the Earth Spear are close to zero, excluding its undeniable weak point: ninjutsu.

A user with enough practice can use this to cover themselves partially (i.e. his hand and lower arm, and the side of his head) without using handsigns.