Shattered King's Defender

Source
This item is dropped by the following in the Return to Karazhan dungeon:


 * Bishop
 * King
 * Knight
 * Rook

Trivia

 * The item is in reference to the King's Defender from the level 70 Karazhan raid.
 * Originally, there was no level requirement for wielding the sword. This was changed in a stealth hotfix during the first week of Patch 7.1.0's release.