Destruction Sphere

A small ball of black starts forming in the users hands. The ball slowly until it is one foot in diameter (This takes 3 turns). During the three turns where the ball is forming it can be used as a melee weapon that all creatures as proficient in. It does 1d6 of necromancy damage. On the fourth turn after the spell was cast the ball expands to 100 feet in diameter and deals 20d100 + 200 necrotic damage (1,069 necrotic damage) (this damage bypasses all Armour, resistances, immunity, potions, spells and other damage blocks/ shields). The spell won't harm the user of the spell, it will harm everything within the 100 ft diameter of the spell. The spell stays in the off-hand of the caster of the spell until the end of the spell.

The level of the character must be 18th or higher to cast the spell without the user to instantly die after finishing the spell. This spell can only be used once a week in DnD time.