Creativity

Angor had returned to The Tributary.

Even though he was allowed to remain at Phantom Island, in order to finish Greya's requested illusion item before her arrival at Brute Cavern, Angor had to use his rented lab as it had better equipment compared to what Phantom Island could offer.

He had spent two days in his lab watching movies, but not doing alchemy.

Fusing illusions into items was a very complicated task to other alchemists, but not to Angor, who was both an alchemist and an illusionist.

He was simply trying to find out which illusion to present to Greya.

While in Dark Castle, Greya asked him to create an "illusionary Toby" that she could interact with. To do this, Angor recreated the experience from when he and Toby traveled to Twilight Town. He then put Greya into the first-person point of view as well as adding some elements of the Nightmare Realm into the illusion.