This is a hard one for me, but it would be any of the Shadow Heart Series, i really loved the battle system, you actually had to have really good timing for the judgment ring, and also evolving and collecting every of's yuri's souls was time consuming and very challenging, especially Seraphic Radiance in the first Shadow Hearts, since you had to fight Amon first, all one on one, those were some of the hardest boss battles i've played in a RPG.
Also collecting every ultimate weapon was fun and the global story was very enthralling
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
