This necklace is powered by M, his power courses through it giving you the following benefits.
Devilish Influence. You gain proficiency in persuasion, if you already have that you instead gain expertise, if you have expertise you gain advantage.
Forsaken Magic. Whenever you deal necrotic, fire, or radiant damage, you can roll damage again for that ability, attack, or spell. Also whenever you cast a spell using a Warlock spell slot, you can make it so it does not cost a spell slot, you can use both of these an amount of times equal to your charisma modifier, you are allowed to use it more than allowed, but you will take 2d10 necrotic damage, your Eldritch Blasts can now do your choice of, Radiant, Fire, or Necrotic damage.
Deal's a Deal. Whenever you attune to this magic item, your soul will be bound to M in a silent pact, if M tells you to do something you must do it exactly in a way that benefits him, you are not allowed to hurt M once attuned, and if you try to you take 4d12 psychic damage.
Notes: Proficiency: Persuasion, by a Warlock
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