Blood Amulet

You hold a shard of Obsidian in your hands, and imbue a blood connection into it. You create a single Blood Amulet, which allows any creature holding it to use their bonus action to deal 1 damage to themselves while holding this amulet to send a message to you of 25 words or less. You can then choose to reply to their message. In addition, a creature holding a Blood Amulet of yours can cast a spell on it as if it were you, applying the effects of the spell to you. As a reaction to a spell being cast on any Blood Amulet you've created, you can negate the effect and destroy the Blood Amulet. You can only have one casting of Blood Amulet active, and casting this spell again destroys all previously created Blood Amulets.

At higher levels. When you cast this spell using a spell slot of 3'rd level or higher, you create an additional Blood Amulet for each slot level above 2'nd