Iron is usually used to describe a hard substance. Various Martial Arts techniques that specialize in physical enhancement are associated with the word 'Iron'. In addition, iron was the second lowest adventurer rank.
It is a hard magnetic silvery-gray metal.
Armor and weapons were commonly composed of iron or steel.
- Járngreipr was noted to be wrought of iron.
- Ainz Ooal Gown purchased several samples of iron ore from various locations to determine their value based on the amount of gold they would produce when inserted in the Exchange Box.