Aethaldin's Illusory Spellbook

A wizard who loses their spellbook is hardly a wizard at all. If your spellbook is destroyed or you find yourself without it, you can reach deep into your mind and focus on the memory of your spellbook recreating it as an illusion. You must pass a DC 10+ the level of your highest spell Arcana check for this to succeed. On a failure, you take a point of exhaustion.

When cast at 9th level, the spell automatically succeeds and the illusion manifests as a permanent physical object.