Arkul's Explosion

The user draws energy from their own magical power and lifeforce to trigger an explosion centered on themselves dealing massive damage.

By default the spell deals 10d8 fire damage within a 20ft. radius. Creatures within the radius must make a DEX save to take half damage. This spells save DC is 2 more than the users usual spell save DC.

This spell drains the user of all magical energy; removing any remaining spell slots (for each additional spell spot an extra 1d8 damage is rolled) and the user cannot regain spell slots again until a long rest.

After this spell is cast the user is immediately dropped to 0 HP and falls unconscious. The user must then immediately roll a death save on the same turn the spell was cast.

The user may overcharge this spell up to three times for additional power;

1. If overcharged once, an extra 2d8 damage is rolled and the user automatically fails one death save.
2. If overcharged twice, an extra 4d8 damage is rolled and the user automatically fails two death saves.
3. If overcharged three times, an extra 6d8 damage is rolled and the user immediately dies after casting the spell.

At higher levels; for each spell slot level above 3 that this spell is cast at, an additional 2d8 damage is rolled.