After his strange encounter with the wood elf and Elia, Jacob focused on his true target, the Cardinal Spirit Church. He was naturally here to investigate the Faery Humans and find some more clues about the Eyes of Judge. As for his body's background, he wasn't interested in it from the start.
After all, he was no longer a Faery Human and was becoming something else entirely. Although he was somewhat curious about his body's past at first, it no longer interested him; even if he found something, he wouldn't care.
Furthermore, the neutral plains were in the center of the conflict plains, so this was the perfect place to observe and lay in wait for what was about to come. However, he wasn't completely sure if the Ice Fiend Locust Queen even took this bait and attacked the conflict plains she couldn't send above the unique rank Ice Fiend Locusts.