Arthur put on his contact lenses, while Evan simply went in like normal, with his mask on.
Their features allowed them to easily blend in with the Aramisians. Arthur had Divinity, and Evan was a Draconic Human.
Aramisians had Dragons on their side as well, with Divine Dragons leading them all. It was very easy for them to mistake Evan for a Dragon on their side, especially since everyone who saw him on the battlefield was in the afterlife.
Their goal for entering the inner regions of Plomux was rather simple. They were meeting up with Artemisia and Beatrix.
Originally, they should have gone the day before, but Beatrix was occupied so they had to go the next day.
Thanks to Artemisia, the two girls could suppress their Divine nature to the point where they appeared to be normal Divine Humans to most people. Other gods would be able to see through them at a glance though.