Eightfold Rune

History
The Eightfold Rune is one of the 27 True Runes. This Rune is held by the being Yuber. Besides its current owner, not much is known about this Rune, although it is possible that it gifts Yuber with some of his otherworldly abilities, such as summoning and teleportation.

One of children rune, the  Eight Devil Rune, grants Yuber the ability to preform a special attack involving himself and two duplicates attacking one target for massive damage.

Not much else is known about this True Rune.

Attacks
If you could use the Eightfold Rune, perhaps the spells would work like this:
 * Inner Pain: Provokes fury and enhances strength of the user by increasing their inner suffering
 * Unquenchable Thirst: Curses all foes by draining 100 HP from them all for 3 straight turns.
 * Ravenous Fury: Provokes bloodlust in other party members making them attack everything randomly.
 * Lake of Torment: An undead dragon emerges from fiery lake to deal 1300 damage to all foes