sentences:  After enlisting the Horror Sedinbale to help him translate a tablet with ancient Makai writing relating to the Natural Release of the Ego Moon, Sigma uses Ratess to obtain the Spirit Pelt needed to control Gyanon before killing him for the Madō Train key to enter the True Demon World where he can get the materials needed to create Idea.Though unmasked during his fight with Kouga and Rei, everyone was under the impression that he is Leo save Kouga on the grounds that something is amiss.It was only when Leo arrives to Kouga's aid that Sigma's identity is revealed.