Deceitful Explosion

You swing your arms in a circle, and a massive explosion triggers from where you were standing. Any creature within a 60ft sphere centered on you must succeed on a Dexterity saving throw or take 20d10 fire damage and be blinded for 5 minutes. On a successful save, damage is halved and the creature is not blinded. During this explosion, you are temporarily teleported to the Astral Plane. The smoke clears after 1 minute, and creatures who aren't blinded will see no evidence of you ever being there. You can use your action to appear back in any space in the affected sphere anywhere between 1 minute and 1 hour after the casting of this spell.