After Grayroad and Fraudrin of the Ten Commandments infiltrated the royal castle of Liones and captured nearly every person within the castle to use them as a host in order to create new Demons, Merlin appears to help their comrades fighting the Commandments.
Grayroad starts the fight using Five Lost. Howzer, who witnesses the engagement, steps into the path of the projectile in order to protect Merlin from losing her senses, but loses his own as a consequence. However, the effects of the attack are shortly nullified by Merlin, much to the surprise of her opponents. Mentioning the danger that Merlin displays, Grayroad the uses Breakable Bugs, only to have Merlin annihilate all of them with Exterminate Ray. Grayroad is sure to be victorious as her Commandment now should take away all of Merlin's lifetime, but Merlin then reveals that she is immune to any effect that attempts to alter her time, including the Commandment, thanks to her magic ability Infinity. She then goes on and reveals her true identity as the last survivor of Belialuin. The two Commandments, utterly shocked, are then approached by the Boar's Sin. Grayroad avoids the attack by splitting into multiple smaller demons, but is effortlessly sucked into a test tube by Merlin's Endless Whirl.
After Grayroad's capture, Merlin announces her interest in her and wants to return to her laboratory. Fraudrin, left alone, decides to retreat but is hindered by Hendrickson, who engages in a fight with the Selflessness.