Promethium

Promethium is the name given to a metal alloy invented by Ryūken Senju. It is a very dense, artificial alloy that is nearly indestructible. Tools made of it are formed of this near-invulnerable metal. Promethium is also capable of generating and absorbing near-limitless amounts of energy, and so can be used as a power source for many gadgets. It is highly radioactive and objects composed of it have proven to slow accelerated healing factors when in contact with someone. Albeit very difficult to forge, weapons and items built in it, are resilient to most forms of damage. It is capable of producing high levels of heat and radiation and is seemingly unaffected by both the agents. However, promethium is a dangerous mutagen that can be used to mutate living beings or trigger their metagene.