Rektanium

Basic Info
Rektanium is the rarest and toughest element known in the Improverse. Its atomic number is 360, as a single Rektanium nucleus contains 360 protons and 420 neutrons. Rektanium is often described as indestructible, as there has been no recorded moment of any Rektanium-based material shattering or breaking apart in any way.