Sovereign Rune

History
The Sovereign Rune is one of the 27 True Runes. It allows its owner to rule free of any and all influences be they magical or natural. Even, other True Runes with their magical coercion spells cannot influence the will of the Sovereign Rune's host.

In addition to bestowing the normal True Rune powers of immunity to illness and agelessness, it also allows its user to transform into the Rune's incarnate form of a 3-Headed Golden Hydra.

Due to its nature, the Sovereign Rune has often been considered the Rune of Monarchs. It was a family heirloom of the Rugner Family for generations. It helped them to rule over the Scarlet Moon Empire. However, the True Rune was not embedded in anyone person, but rather in a powerful and legendary weapon called the Dragon King Sword. A sword considered as revered as the Star Dragon Sword by some blacksmiths.

The current whereabouts of the Rune are unknown. In one fanfiction, the Serenity Rune is an offspring of this True Rune.

The Sovereign Rune has no known current owner. Its most notable previous user was Emperor Barbarossa Rugner via the Dragon King Sword.

Attacks
The final attack is perhaps why the wielder of the True Rune would prefer it to be embedded in a powerful weapon instead of himself. However, if the Sovereign Rune's spells could be seen and used. Perhaps they would look like this:
 * Kingsguard: Repels any magical attacks on all allies once.
 * Absolute Clarity: Removes negative status effects. Increases everyone accuracy in battle.
 * Commanding Presence: Causes the whole party to become inspired (fury) for 3 turns.
 * Supremacy: Triples the strength of the user and channels that power into one attack from their weapon.