Paradox Collapse

You create a 15 ft. radius wide sphere of paradoxical gravitational energy and fire it in a line 300 ft. long. Each creature in the path of this sphere must make a Constitution saving throw. On a failed save, a creature is pushed back by the sphere to its end point, where it explodes, taking 30d6 Force damage. Creatures who succeed on the saving throw are pushed 5 ft. out of the sphere's path and take half dmg. Nonmagical terrain, structures, objects, and creatures reduced to 0 hit points by this spell are annihilated.

Convergence. This spell can also be cast once per day by combining the spheres cast by Pocket Singularity and Inverted Density. To use the spell in this way, you must have the ability to cast level 9 spells, know Paradox Collapse, and combine a Pocket Singularity of 5th level or higher with an Inverted Density of 6th level or higher. When cast in this manner, Paradox Collapse immediately explodes from the point where the two spells met. Each creature within 60 ft. of the converging point must make a Constitution saving throw, taking 20d6 Force damage on a failed save, and half as much on a successful one. Nonmagical terrain, structures, objects, and creatures reduced to 0 hit points by this spell are annihilated. Nonmagical terrain, structures, and objects within 120 ft. of the epicenter are damaged. 

Amplify. As a reaction, you can choose to amplify Paradox Collapse. When amplified as Paradox Collapse, you can double the size of the sphere. In addition, you can expend a spell slot of level 5 or higher to cause all creatures in the path of the sphere to have disadvantage on their Constitution saving throws against the spell.

If you choose to cast it as Paradox Collapse - Convergence and amplify the resulting spell, instead of the above amplification, you teleport to a point within 30 ft. of the epicenter to reinforce the destructive force with your own magic, as the spell deals an extra 20d6 Force damage.