Vulture's Claw

From Gineipaedia, the Legend of Galactic Heroes wiki

The Vulture's Claw, or Geiers Haken (Japanese: ガイエスハーケン), was an X-ray beam cannon with output of 740 million megawatts and the primary weapon of the Galactic Empire's Geiersburg Fortress. It had an effective range of 600,000 kilometres. It was the second most powerful fortress cannon built by the Empire, second only to Iserlohn Fortress's Thor Hammer. (LOGH: 'Bloodshed in Space', 'War Without Weapons')