Cranium Arcanum

You target the skull of a medium or smaller creature and store a spell within it for later use. When you cast this spell, you choose a spell you know of 3rd level or lower that you know and have prepared. The spell cannot be one that target’s individual creatures, and it must have a duration of instantaneous. At any given time, you may have a number of spell skulls equal to half your spellcasting ability modifier (rounded up; minimum 1).

Once created, a spell skull levitates within your space for the duration of the spell, or until you command it to do otherwise. You may mentally command the spell skull to act in the following ways as either an action or bonus action on your turn:

• Move. You command the spell skull to fly at a speed of 30 feet. The skull cannot move further than 120 feet away from you. If it does so, the spell skull is considered to be set (as described below) without a trigger.
• Follow. You command the spell skull to follow you. It remains in your space until you command it to do otherwise.
• Set. You command the spell skull to remain motionless in a specified location. When you do so, you may verbally specify a trigger that will cause the skull to activate, such as “Activate when a creature comes within 10 feet”, or “Activate in 10 minutes”. The skull has no ability to distinguish between different creatures. A set spell skull has a duration of 24 hours. At the end of this time, the spell skull and the stored spell are both dispelled without effect.
• Activate. You command the spell skull to trigger the stored spell. The spell skull is immediately destroyed and the stored spell takes effect with the skull acting as the spell’s point of origin.

When a spell skull is not following or sharing a space with you, it has an AC and a number of hit points equal to your spellcasting modifier (minimum 1). If it is destroyed by any means, the stored spell immediately activates.

A spell skull may be targeted by dispel magic. If it is, the DC equals 10 + the spell slot level used to create the spell skull. If dispel magic succeeds, both the spell skull and the stored spell are dispelled without effect and the spell skull immediately becomes a mundane skull once more.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you may store a spell of equally greater level (eg. You may store a 4th level spell for a 6th level spell slot; or a 7th level spell for a 9th level slot).