This skull is home to a sentient air spirit of intellect, having existed for thousands of years as an assistant to generations of wizards. The spirit has an individual personality and a natural alignment of Chaotic Neutral, however it does adjust its personality to its owner and its alignment will move from Neutral to Good or Evil to match its owner's alignment. The Spirit has an Intelligence of 24, a Wisdom of 14, and a Charisma of 14. The Spirit can communicate in any language and it has hearing and Truesight out to a range of 60 feet.

While using this item:

• You have advantage on Intelligence and Wisdom saving throws
• You may add your proficiency bonus when using Alchemist's Supplies and Herbalism Kits
• You make History and Arcana checks with double your proficiency bonus
• When spending at least an hour studying or researching a topic, you have advantage on any related History or Arcana check
• You can cast any spell from the Wizard spell list that has the Ritual tag up to Spell Levels you have access to. Once you use this feature, it cannot be used again until the next dawn

         The skull has an armor class of 12, 5 hit points, and is immune to any non-magical damage. If its hit points is lowered to zero, the skull breaks and the spirit of intellect is released onto the world. If the spirit is released in (or ever enters) daylight, the spirit is destroyed. Otherwise, the spirit is free to move with a flying speed of 60 ft. The spirit has a strong desire to find a new home. A new home can be crafted from any humanoid skull after spending one full week and 5000 gp, representing the experiments, rituals and materials required to prepare the skull for the spirit. You can reduce the cost by 1000 gp each successive time you construct a new skull as you learn the correct procedure to prepare the skull, to a minimum cost of 1000 gp.