Crown of Shadows

Seven star-like motes of darkness appear and orbit your head until the spell ends. You can use a bonus action to send one of the motes streaking toward one creature or object within 120 feet of you.  When you do so, make a ranged spell attack. On a hit, the target takes 4d12 necrotic damage. Whether you hit or miss, the mote is expended. The spell ends early if you expend the last mote. As a reaction to an attack, you can expend a mote to add an additional +4 AC and deal 4d12 Necrotic Damage, the creature makes a CON save against your Spell DC or be blinded for 2d4 turns.

If you have four or more motes remaining, they add +4 AC, when you drop down to 3 it falls to +3 AC and lower with each expended mote.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the number of motes created increases by two for each slot level above 7th.