This ancient tome is bound in blackened leather and adorned with silver runes that seem to shift and writhe upon its surface. Its pages are filled with eldritch symbols and forbidden knowledge, each one more potent and perilous than the last. The Tome of Eternal Darkness has the following properties:

• Forbidden Knowledge: While attuned to the tome, you learn the spell eldritch blast  Your eldritch blasts deals necrotic damage instead of force damage.
• Dark Rituals: You have advantage on Intelligence (Arcana) checks when researching or performing rituals related to shadow magic or necromancy.
• Cursed Lore: While attuned to the Tome of Eternal Darkness, you have disadvantage on saving throws against spells and effects that deal radiant damage.
• Master of Shadows: The Tome of Eternal Darkness contains knowledge of all shadow spells that Usarian has mastered or created. You can use the tome as a spellbook, allowing you to prepare and cast any shadow spell contained within it, regardless of class restrictions. Additionally, you have advantage on Intelligence (Arcana) checks made to learn or create new shadow spells.