Codex Of The Necromancer
Wondrous Item (book), legendary (requires attunement by a necromancer)
pair with the ORB OFDEATH
Effect 1: You gain a +3 bonus to spell save DC
Effect2: Undead summoned through the ORB OF DEATH gain + 2 AC
Effect3: While attuned and holding the codex, you emit a 30-foot aura that suppresses undead hostility. Undead creatures of CR equal to or less than your level cannot attack you unless you attack them first or force them to make a saving throw.
Effect 4 (LOCKED): The Codex tracks the souls you have claimed. When a creature dies to a necromancy spell within 60 feet of you, you may choose to bind its soul into the book as a reaction (no action required). The Grimoire can hold up to 5 souls at a time. You can expend a bound soul to:
Automatically succeed on a saving throw against being frightened or charmed.
Empower a necromancy spell, making it deal maximum damage.
Effect 5 (LOCKED}: when paired with the ORB OF DEATH when dropped to 0 hit points you can sacrifice an undead to die in your place.
To unlock effect 4 and 5 the attuned user must sacrifice the closes one to them.
CURSE: The Codex is sentient (Int 16, Wis 18, Cha 16), Neutral Evil, and whispers vile secrets in a ancient tongues. It seeks to spread undeath and opposes any attempts to destroy it. It may occasionally demand that you perform a dark ritual or punish you by withholding a benefit if ignored.
The Codex Of The Necromancer is a grimoire of a lich from thousands of years ago, covered in the skin of a ancient extinct beast and with a skull on the front frozen in a scream of agony. The codex seems to be missing a vital piece as the pages in the book are without words, any attempt to revel the words is met with a curs, The only way to read the pages in the codex is through the missing piece.