Sword of Damocles

A giant sword of ethereal radiance appears, floating in the air above a point you can see on the ground within range. The sword has a length of 120 feet(90 feet blade, 30 feet hilt). The blade's tip floats 480 feet above that point, and appears to hang by a single radiant thread that extends to the heavens. 

When the sword appears, each creature within 1 mile that can see it must make a Wisdom saving throw or become Frightened of it.

You must use your action on each subsequent turns to maintain concentration on this spell. If your concentration ends prematurely, the thread of radiance holding the blade floating is severed. Your concentration also breaks if you leave the current plane of existence or move beyond the range of the spell.

Once the thread is severed, the sword begins rapidly descending to the ground, moving at 240 feet per round. When the sword's tip reaches the ground, its energy is released in a catastrophic energy blast. Each creature in a 120-foot radius around the sword must make a Constitution saving throw. On a a failed save, a creature takes 12d12 radiant damage and 12d12 force damage, or half as much damage on a successful save. Creatures within half of the spell's radius have disadvantage on the saving throw. Buildings and structures take double damage. Once the sword's hilt reaches the ground level, the blade vanishes, leaving behind a 30 foot long, 15 foot wide, 90 foot deep crater in the ground.

The spell's power and range increase the longer you maintain concentration. For each minute after the first that you maintain concentration, the radius of the impact and the range of the spell increase by 120 feet (up to a maximum radius and range of 1,200 feet). Additionally, the damage increases by an additional 1d12 radiant damage and 1d12 force damage for each minute (up to a maximum total of 24d12 radiant damage and 24d12 of force damage).

If the spell is activated before its full power is reached (either by losing concentration until the duration is up, or failing to use your action to maintain the spell), the unchanneled energy backlashes onto you. You must make a Constitution saving throw or take any remaining damage that the sword would have dealt as radiant and force damage. On a successful save, you take half the damage.

- Credit attested to @adramastesgm on TikTok