Tenkai Knights Episode 18 The Key to Evil Episode Title:The Key to Evil.Episode Description:Beni tricks the Knights to travel to Quarton into a trap. Another Guardian named Eurus appears to be helping her and Gen to keep balance because Boreas is helping the Knights. The Knights on Quarton have to battle evil clones of themselves created by Eurus. Meanwhile on Earth, Gen begins to get suspicions of Mr. White. The Knights unlock Titan Fusion and tributan destroy the clones. Beni is surprised that they won and realizes she shouldn't under-estimate them. Dromus and Eurus talk about how to use the Tenkai Knight's Titan Fusion to find the Black Key.