Blinding Trap Rune

You draw a rune on a solid surface, once the rune is completed it turns invisible. When a creature comes with in 10 feet of the rune it must make a constitution saving throw, on a failed throw the creature becomes blinded for 1 minute, on a successful save the target does not become blinded. As a reaction you can make the rune not auto-activate and you can use your bonus action to active the rune and increase its range by 5 feet.