Doom

You spread the titan's blood around you in a 5' by 5' circle, whilst chanting ominous words. Everyone who is outside the circle in a radius of 5,000 feet mist take a DC 30 Constitution saving throw of take 80 d10 necrotic damage on a failed save, and 70 d10 on a sucessful one. Everyone inside the magic circle (including you) then takes 1d10 necrotic damage. Every plant and animal within the radus is instantly killed, water turns stagnant, and rock turns black and cracks. Ash fills the air, making everything lightly obscured. You then fall into a coma for 4d10 days. When you wake up, you must reduce your constitution score by five.