Iron Flesh

Iron Flesh is a runic spell that appears in Ultima Underworld I and II.

Description
This spell offers the greatest protection of any known runic spell, rendering its caster nigh invulnerable to damage. Using Iron Flesh allows a magician to withstand nearly any peril, and may even be used to withstand the fury of a loosed djinn.

Trivia

 * In Ultima Underworld II, purple potions of Iron Flesh may be found occasionally throughout the game world, and may be purchased from the Killorn merchant, Merzan, despite their illicit status on that world.