Necrodermis

Necrodermis is a green/yellow fantasy metal obtained from Necrodermite.

It is used for armour. The armour will slowly repair itself overtime.

Necrodermis is from Games Workshop's tabletop strategy game; Warhammer 40,000, it is what the xenos race, The Necrons, are made entirely of. It is a material of unknown origin and chemical or molecular structure that possesses the extraordinary ability to regenerate almost all damage instantaneously, "flowing" back together as if it were a liquid while closing bullet holes, mending gashes and tears, or even reattaching severed pieces with little delay.