Spellburrow

These scarab-like symbionts, bred by the daelkyr Valaara, have brilliant, iridescent shells. To attune to it, you must place it on your head; during the process of Attunement, it burrows through your skull, establishing a psychic connection with you. While it lacks human consciousness, it possesses a strange alien sentience that responds to your desires. There are tales of rare Spellburrows that possess greater knowledge and sentience; such stories sometimes end with the Spellburrow consuming the brain of the wizard who pushed it too far—but these are surely just fanciful stories!
A Spellburrow knows one cantrip of the DM's choice drawn from the Sorcerer or Warlock spell list, and you can cast this cantrip as if you know it. In addition, a Spellburrow knows one level 1 spell and one level 2 spell from the same spell list its cantrip is from. If you have the Spellcasting or Pact Magic class feature, you can cast these spells as if you had prepared them, and they don't count against the number of spells you can prepare. You can choose to use either your Intelligence modifier, or a spellcasting ability modifier you have gained from another source, for these spells.