This charm manifests as dimly luminous red visage of a brain, bisected down the middle. It appears at the base of your skull where the spine meets as if it were a tattoo. If you have hair that falls or grows over the charm, the red light of the charm shines through your hair dimly.
For the next seven days, you have advantage on all Constitution saving throws made to maintain concentration on a spell. Additionally, your spell save DC is increased by 1. After seven days have passed, the charm fades from your body and its benefits end.
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