Ditched Layle because he doesn't appeared on my support list even after waiting for the whole night. Built up my strategy back from ground with Papalymo (MLB'ed him on Alisaie/Terra EX banner lol) and damn this really become so easy. This quest is pretty much a boss rush just like Heretic 4. All 4 stages are equally strong boss battle so it doesn't really matter where you use support and summon, just use it as you see fit. For me, I used support at 2nd fight because it will take too much turns if I can't
Hide player controls
Hide resume playing