Attunement Gem (Superior)

This tiny cut jade gem allows its user to attune to additional magical items at a risk. As a part of a long rest, a creature can rest the stone in the middle of their forehead. When they complete this rest, they awaken to the gem magically affixed to them. A user can choose to remove a gem that is affixed to them as apart of a short or long rest.  As long as the gem remains affixed to the users head, they gain an additional 3 attunement slots. 

The gem has an AC of 15 and an HP of 75. The gem can be forceably removed by contested intellegence check. If the gem is forceably removed, or destroyed, while still affixed to the user, every creature within a 10 foot radius sphere  of the user must make a DC 20 Dexterity saving throw. On a failed save, acreature in this sphere takes 6d12 force damage for each magical item the user was attuned to and are stunned until the end of their next turn. On a successful save, a creature takes half as much damage and are not stunned. 

Notes: Set: Attunement Slots, Stunned