Harnessing the power granted by the book, The Endless Eldritch shoots out tentacles all over from her body, dealing 1d8 damage to everyone in a 30 foot radius of her. This includes allies as well,.

When The Endless Eldritch  gets to level 10, the damage increases to 1d12, and at level 20 increases again to 2d12 damage.

Even in the midst of a battle that could end poorly, The Endless Eldritch  can uplift her teammates with inspiring words. When she uses this as a main action, her teammates all gain advantage for one turn and heal for 1d10.

The tentacles that are given to her via the Eldritch Book have many uses, being able to help her swim, climb on surfaces, and even stick to surfaces most others can't.

Although to anyone who can see the ethereal energy, the tentacles may be horrifying, The Endless Eldritch's presence is calming, and her soothing voice helps to ease those around her. When speaking, those within ten feet of the Eldritch wielder are automatically calmed, cannot be frightened, and have advantage on Charisma saving throws.

Having been one with the book for so long, the Eldritch wielder has unlocked its final form. When they unleash this form upon the battlefield, any foes who have sight on the target must make Wisdom Saves of 15. If they fail, the foe is instantly in an insane state, and cannot act, move, or think properly until they beat Wisdom save.

This power can only be used once per week, due to it being a heavy toll on the body of the wielder.