Wondrous Item, artifact
The Spellbook of Azuth appears to be a normal, beginner's spellbook. When used as an Arcane Focus by one of Azuth's Chosen, it grants additional abilities.
You gain resistance to Psychic damage.
You gain a +1 to your AC as long as you are not wearing armor.
Notes: Bonus: Unarmored Armor Class, Resistance: Psychic
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