An Arc Claw is an electromagnetically-empowered melee Arc Weapon usually deployed on the Kataphron Breacher Battle Servitors of the Adeptus Mechanicus' military forces. During the Cyberghoul Wars, the burrowing daemon machines of Warpsmith Votogr Bolga were met talon to talon by the Forge World Metalica's Battle Servitor defenders.
It was the invention of the Arc Claw that turned the tide -- a potent delivery system for the most sophisticated scrambler technology the Adeptus Mechanicus could devise.
- Codex Adeptus Mechanicus - Cult Mechanicus (7th Edition) (Digital Edition), pg. 238