Amulet of Null

This amulet was created by Null, the dragon god of undeath. It created this amulet in an attempt to empower a necromancer's ability to control the undead and life itself. This amulet appears to have a blackish red gem that seems to glow slightly the darker it is. The top of the gem is connected to a  tiny silver chain that holds it up.

Guardian of the Lost. The Command Undead feature of a necromancer wizard attuned to this amulet no longer has an Intelligence restriction on it. Furthermore, if you are a necromancer of 20th level or higher, the effect can have up to three undead creatures under its control at a time without losing the previous creatures this effect was used on.

The Reaver. Undead that were created by a spell cast by the attuned creature gain a bonus to all their melee attack rolls equal to the attuned creature's proficiency bonus and have advantage against being turned.

Artifact Properties. The creature attuned to this amulet gains the following effects:

• While attuned to this artifact, you gain resistance to damage caused by undead.
• While attuned to this artifact, you are immune to disease.
• While attuned to the artifact, your Intelligence increases by 2, to a maximum of 24.

Notes: Bonus: Intelligence Score, Immunity: Disease