Arcane Cataclysm

When you have accepted that you are going to die, you cannot let your friends die with you. you shatter the veil of reality itself, unleashing a burst of power unheard of to man or beast. Not even the gods have seen such power as this for centuries. You use every bit of your arcane power to release a burst of energy from your body. This burst deals 20d10 fire damage to creatures within 5 feet of you. The attack does 1d10 less damage for every 10 feet farther a creature is. An object wall or structure that takes 30 damage or more collapses into a pile of rubble. any creature in the way of a collapsing structure must make a dc20 dexterity saving throw. On a failed save the object crushes the creature, dealing 10d10 bludgeoning damage and the creature is restrained. The object can be removed by a dc30 strength (athletics) check. If the object is removed, the creature is no longer restrained. on a successful save, the creature takes half damage and isn't restrained. A creature in the way of 2 falling objects takes the damage only once. After casting this spell, you automatically fail your death saves.