Bone

Bone
Bone can be used in place of wood and steel in weapons and armor. Other animal-based materials like horn, shell, and ivory also use the rules for bone weapon and armor.

Armor: -1 armor or shield bonus. Gain the broken condition when hit with a critical hit (fragile).
Weapons: -2 penalty on damage rolls. Gain the broken condition on a natural 1 (fragile).
Special: Bone items cannot be masterwork.
Hardness 5; Hit Points 5 per inch