Deep Purifier's Detection Pulse

You gain Blindsight with a range of 30 feet. In addition, as a Bonus Action, you can send out an undetectable pulse of light. Each creature within 30 feet of you and not behind Total Cover must make a Dexterity saving throw evade detection by you. A creature can willingly fail this save. Invisible creatures make this save as well. On a failed save, you can detect the creature using your Blindsight. On a success, they are not detected. You can use this even if you are Blinded, but creatures make the check with Advantage. When you cast this spell with a spell slot level higher than 3, increase the Blindsight you gain by 5 feet, and the spell lasts 1 hour longer for each level above 3.