The Diamond Assassins were characters in Custom Mod Adventure: Diamond Dimension Robbery. They stole the Diamond Reactor, which meant that if the Diamond Reactor wasn't placed soon, all the Diamonds in the Minecraft World would be replaced with TNT. Dan made a trap to catch the person who was stealing the diamonds, and the next day, a Diamond Assassin was in there. The Assassin admitted that there was a pipe above the Chest, and Dan followed the pipe up to the Diamond Assassins' hideout. He knocked out all the Assassins with his Pickaxe, then went to the Bank Employee. After, Dan and Trayaurus blew up all the TNT surrounding the Diamond Assassins' hideout, killing most of them. However, the Diamond Assassin that was trapped in the cage managed to escape. It is unknown where he currently is.