Redeemer

The 'Redeemer is a Super Weapon that has been around since Unreal Tournament. The gun causes a massive nuclear explosion that obliterates anything within it's damage radius.

Unreal Tournament 2004
''The first time you witness this miniature nuclear device in action, you’ll agree it is the most powerful weapon in the Tournament. Launch a slowmoving but utterly devastating missile with the primary fire; but make sure you’re out of the Redeemer’s impressive blast radius before it impacts. The secondary fire allows you to guide the nuke yourself with a rocket’s-eye view. Keep in mind, however, that you are vulnerable to attack when steering the Redeemer’s projectile. Due to the extreme bulkiness of its ammo, the Redeemer is exhausted after a single shot.''