Wondrous item, artifact (requires attunement by a spellcaster)
The Tome of the Unrelenting Earth is one of the five legendary works written by an ancient elven wizard known as Xaturos the Illuminator. For five hundred years, Xaturos scoured the four Elemental Planes and the Astral Plane seeking lost knowledge before supposedly settling in the Astral Plane, though countless conflicting tales of the wizard's whereabouts abound, mixed in with tales of his death.
The book's covers are made from stone that looks rough yet feels smooth to the touch and inlaid with garnets and small pieces of metal that seem to glow with the power of elemental earth, while its pages are made from stone that looks rigid, yet bends as easily as parchment. The book can weather even the most powerful of strikes entirely unscathed, as it has been recorded to have spent at least a decade trapped within the fissure left by an earthquake, before being ripped out by a wandering bulette. The book contains intricate descriptions of many powerful beings of elemental earth, along with descriptions of countless creatures of elemental earth, from earth elementals to xorn. The book is held shut by a clasp shaped like small stones. Only a creature that has attuned to the tome can open the clasp. Any other creature that attempts to open the book is flattened by falling rocks, taking 20d6 bludgeoning damage. This damage ignores resistance and immunity, and it can't be reduced or avoided by any means. A creature reduced to 0 hit points by this damage turns to a pile of dirt and is destroyed alongside any nonmagical possessions. Magical possessions remain intact, though they are covered in dirt and rubble.
Power of Stone. While you are attuned to the tome, you are immune to nonmagical bludgeoning damage and resistant to magical bludgeoning damage. Additionally, when you deal bludgeoning damage, you deal an additional 1d6 bludgeoning damage.
Spells. The tome has 7 charges and regains 1d4 + 3 charges daily at dawn. You can use an action and expend one or more charges to cast one of the following spells (save DC 18) from it: arcane hand (giant stone hand that deals bludgeoning damage, 3 charges), blur (2 charges), meld into stone (2 charges), sleep (5th-level version, 3 charges).
You can also use an action to cast the fog cloud spell from the tome without using any charges, creating a cloud of dust.
Random Properties. The Tome of the Unrelenting Earth has the following random properties:
- 2 minor beneficial properties
- 1 major beneficial property
- 2 minor detrimental properties
Destroying the Tome of the Unrelenting Earth. The Tome of the Unrelenting Earth can be destroyed when hurled into the Elemental Plane of Air by a creature that has attuned to it and left there for a full hundred years, at which point the book disperses into rubble. Any other attempt to destroy the tome seems to work, but the tome reappears in the Plane of Elemental Earth.
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