Hirasawa's songs as openings for each arc

So youtube recommended me some Hirasawa stuff today and I thought of how cool some of the songs match post eclipse arcs. I think some of you may enjoy the idea and maybe discuss/sugest other songs here. I tried to pick songs unused in animes/games yet Anyways, that's how it looks: Forces 2 for The Black Swordsman arc; Large Chamber for The Lost Children chapter ; Qualia Tower for Conviction arc; No idea what to choose for FOTME arc; Niwashi King for the boat saga/Fantasia arc;