Barbed Circlet of Concentration

A barbed circlet that's magical spikes burrow into your skull, invigorating your synapses and allowing you to concentrate on two concentration spells for up to a minute (10 rounds). 

Whenever you cast a second concentration spell, you take 1d6 + both spells' levels in psychic damage. You take this damage at the start of each of your turns afterwards for as long as both concentration spells are up. Any time you make a Constitution saving throw to maintain concentration due to taking damage, the DC equals 10 + both spells' levels combined, or half the damage you take, whichever number is higher. On a failure, you lose concentration on both spells.

The circlet can only be used in this manner once per long rest.

You take 8d8 piercing damage whenever you first attune to this item, and another 8d8 psychic damage should you ever unattune. It is impossible to take off the circlet without unattuning.

Notes: Headwear