Geomancer's Slates

Wondrous item, very rare (requires attunement by a wizard)

This leather-bound book of stone tablets weighs 25 pounds. Whenever you finish a long rest while attuned to it, you can prepare the following spells from it as if they were wizard spells in your spellbook, provided the spell is of a level for which you have spell slots: earthquake, flesh to stone, meld into stone, stone shape, and wall of stone. The tablets' markings and its spells are only legible while you're attuned to it.

The book has 7 charges for the following properties. It regains 1d6 + 1 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the spellbook crumbles into dust and is destroyed.

Earth Casting. While the book is on your person, you can expend 1 or more of its charges when you cast one of the spells listed above. For each charge you expend, the level of spell slot needed for that casting of the spell is reduced by 1. If you reduce a spell's slot level to 0 in this way, you can cast the spell from the book even if you don't have it prepared.

Stone Armor. While the book is on your person, you can use an action to expend up to 3 of its charges. When you do, you coat yourself in a layer of stone, granting you 1d10 temporary hit points, plus an additional 10 temporary hit points per expended charge. While you have these hit points, you have resistance to bludgeoning, piercing, and slashing damage.

Stone Shield. While the book is on your person, you can expend 1 of the book's charges as a reaction when you take damage. When you do, the damage is reduced by 1d10 + 10. If the damage's type was bludgeoning, piercing, or slashing, the amount of damage reduced by this effect is doubled.

The only truth written in stone is this: that even stone will change.