Lucius' Kleavor is one of the fabled Six Heroes. It was revealed to
Liko by her grandmother
Diana.
Liko and the others met
Perrin in the Land of Kitakami, and she had taken a photo of a Kleavor. After learning this photo was taken on Mt. Tengu, they went searching for Kleavor there. They followed the axe marks in stones and trees which lead them to a waterfall where Kleavor from the Six Heroes finally showed itself.
Kleavor challenged and tested Liko, Roy and Dot in a battle to see if they were strong enough for him to follow them. After an intense 3-on-1 battle,
Liko's Floragato,
Roy's Crocalor and
Dot's Quaxwell proved to it that they were strong and it had to use its signature move Stone Axe to hold them off.
In a flashback memory,
Lucius and confronted Kleavor who had been tied up by the local villagers as it was interfering with their farming.
Lucius untied it and it attacked him but
Lucius' Lapras protected him from the axe but was hurt on its neck in the process which left scars.
Lucius challenged Kleavor to leave the villagers in peace and join them to find the paradise known as Rakua and it agreed entered the Ancient monster ball.