Your bond with Cthulu has granted you this halo granting you with superior insight into the world around you.

Superior Perception. You're bond with Cthulu has granted you increased perception. You can cast the See Invisibility spells at will.

Precognitive Reaction. You're halo grants you insight into a possible future. When an enemy makes an attack against you, before you see the results of the roll, you can choose to force them to reroll the attack roll possibly resulting in a miss. You can do this a number of times equal to your proficiency bonus. You regain all expended uses after a long rest.

Observe the Unseen. Open your minds eye to see the unseen corners of reality. Once a day you can cast the True Seeing spell targeted only on yourself and lasting until the end of your next turn. You regain this use the next dawn.