Blasting Inferno

You conjure a blasting inferno in ten 10-foot cubes centered on points within range. The inferno lasts for the duration, and the spheres cannot overlap. When you cast this spell and at the end of each of your turns, creatures in a cube must make a Dexterity saving throw, taking 6d10 fire damage on a failed save(half damage on a success). In addition, each turn, assign each cube a number from 1 to 10, reusing no numbers, and roll a d10 at the end of each of your turns. If the number the d10 rolls equals the number on a cube, that cube creates an uncontrolled chain reaction with itself. This causes the caster to take 1d10 force damage; however, when this occurs, creatures in that cube take an extra 6d10 fire damage plus 6d10 force damage. In addition, if the d10 rolls for the same cube twice in a row, the chain reaction sustains itself using material from the other cubes; all the other cubes of inferno are extinguished, creatures in the cube take 8d10 fire damage plus 8d10 force damage, the caster takes 2d10 force damage, and four meteors of flame blast from the cube to explode, creating four 10-foot radius fireballs(spheres) centered on points within 30 feet of the cube's center. Creatures in these fireballs when they appear must make Dexterity saving throws, taking 4d10 fire damage plus 4d10 bludgeoning damage on a failed save(half damage on a success). The spell then ends.