Athena's A-bomb

This was inspired by the World Anvil Summer Camp of 2021: An Ancient and/or Powerful Artifact

Now, I am become Death, the destroyer of worlds.

— Bhagavad-Gita

Athena's A-bomb is a magical A-bomb that has been enhanced by Magi-crystal and magical energy. A Greater Feather spell was cast on it to reduce its weight. Created by Alton City in the year 3455, it was tested off the southern coast of Alton City on the man-made island now known as Toxic Island. Alton City created it to ward off the Alien Invasion of 3454. The whole of Renga knew of the blast.
The Alien Invasion of 3454 forced the development to rush for this weapon. Alton City was the only nation on the continent of Renga that could withstand their assault. So for the sake of their allies they made the bomb. After the bomb was tested the invaders retreated.
The bombs were very large. Due to this, the bombs had the spells Greater Feather, Minimize, and Permanency cast on them. This ensured that the bombs could be used in actual combat.
The mushroom cloud could be seen from the whole continent of Renga. A nuclear winter that lasted 3 years was left in its wake. It was called the First Poison Ice Age.
Alton City tested at least one. The total number made was unknown.

Type: Thermonuclear
Place of Origin: Alton City
Manufacturer: Alton City
Number Built: Unkown
Force Measurement: 3000 Megatons
blastwave: 3,000 square kilometers (1158.306 Miles)
Fireball Radius: 25 Kilometer (31.0686 Miles)
Thermal radiation radius: 250 Kilometer (155.343 Miles)
Mushroom Cloud Height: 50 Kilometer (31.0686 Miles)
Crater Radius: 5 Kilometer (3.106 Miles)

Item type

Weapon, Explosive

Manufacturer

Alton City

Owning Organization

Alton Shadow Council

Rarity

Very Rare

Weight

30,000 lb / 13607.771 kg

Dimensions

Diameter 3.1 m / 10 ft 2.04in ; Length 9 m / 29ft 6.3in

Base Price

18.514 billion gp

Raw materials & Components

Mithril, Greater Feather Spell, Uranium-235, Uranium-233, Plutonium-239, Gold, Silver, Magi-crystal