The grimoire, along with anything written on its pages, can't be damaged by fire or immersion in water. In addition, it doesn't deteriorate with age.
Once every week, the wielder of the Grimoire can sacrifice a learned spell for another one of their choice from the Arcane spell list.
Additionally, the Grimoire has 3 features of G'shaj, chosen freely from these features:
- You have advantage on saving throws against spells and magical effects.
- Your spells can be cast as if they were cast from any point within 40 meters, as long as you're still within the required range. The help of G'shaj can only be seen by truesight.
- When you prepare spells using the grimoire as your spellbook, the number of spells you can prepare increases by
1 + half your level. - As a bonus action, magically teleport the grimoire into your hand. You cannot be disarmed from it.
- You can now use your Arcane Recovery feature twice between long rests, rather than once.
- You can use your Arcane Recovery feature as an action.
- You gain a +1 bonus to spell attack rolls and to the saving throw DLs of your spells.
The features can be swapped after a long rest.