Chainsword

The Chainsword is a Hardmode weapon that is both a Sword and an Axe. It can be dropped by the Motherboard.

Trivia

 * This may be a reference to Warhammer 40,000's melee weapon used by Space Marines and Chaos Space Marines that goes by the same name. It also bears a striking resemblence to the sword in Warhammer 40,000.