Wood

Wood armor is generally flexible and light, but it can splinter as it breaks, throwing off shards and fragments that damage foes who deal you critical blows. If a foe critically hits you with a melee unarmed attack or critically hits you with any melee attack while adjacent to you, it takes piercing damage equal to 3 + the armor's potency rune value for medium armor, or 5 + the armor's potency rune value for heavy armor.