Untarnished Great Runes is a mod that gives you a set of powerful runes. Each of them has different abilities and can be used as a tool to fight mobs or to cast powerful spells.

You will become a real Elden Lord once you have a great rune equipped and activated:
Unaffected by any kind of harm.
Any status-related impacts are impossible.
Protected from typical fall harm.
Incapable of dying instantly from high falls.
Maintain unwavering composure to avoid falling, getting interrupted, or even flinching while enduring any attack or trap in the game.
If you lose health for whatever cause, an immediate healing factor will be activated.
Never lose endurance when attempting to attack or block.
Never run out of FP when using any item, skill, or spell.
Never lose a rune when you die.
Stop your enemies from rising from the dead.
Shields and stone foes are unable to defend against attacks.
Summoning invulnerable spirits is only possible with Mohg's Great Rune.