The Prototype

From HBM's Nuclear Tech Wiki

The Prototype is a fictional bomb that creates a Fölkvangr Field upon explosion. It destroys everything in it's blast radius. The crater is always spherical. It also destroys bedrock except the bottom ones. The blast radius is 150 blocks wide.

Crafting

The bomb is assembled with the following:

Assembly MachineAssembly Factory
The Prototype

Detonating

The bomb requires these materials before detonating:

Effects

Right after detonation.
The spherical crater in a flat world.