Dark Divination

You sense an evil, otherworldly presence guiding your every move. For the duration, you may choose not to be surprised for one round, and choose to have advantage on attack rolls, ability checks, or saving throws for one turn. Additionally, you may choose for other creatures have disadvantage on attack rolls against the you for one turn.

This spell immediately ends if you cast it again before its duration ends, and every time you choose to have one of those things happen (which you can do any number of times) you feel a singing sensation in your brain, causing you to take 2d8 psychic damage.