The Night of Banquet
'Superficial, fake, presumptuous, narcissistic—such is the quality of an average Priest. They only respect their fellows and look down on anyone that is not a part of the Temple's hierarchy—even their God's believers.'
As Layland was accompanying Winerva eating at the café in front of the Temple, he was sneakily observing how the Priests who were coming in and out of it behaved.
He learned one thing from his observation: it was easy to impersonate a Priest as long as one had the outfit. He, fortunately, had kept the uniform of the Priest whom he had a tough battle with, so doing it would be a piece a cake.
Of course, he also needed to know how to act after entering the Temple. Thankfully, he had learnt as much as he could, and the only thing left for him was mapping the entire Temple.
Normally, he could do it easily by entering the Temple, which was a public place, and pretended to pray there.