It's one of the more challenging RPGs of the previous generation, and it definitely has a unique style.
If you missed Resonance of Fate when it first launched back in 2010, here's another chance: It's on the North American PlayStation Store right now.
Developed by tri-Ace, this game (known as End of Eternity in Japan) is set in the distant future, where layers of poisonous gas have enveloped the earth. As such, the surviving humans built Basel, a device that could remove the damaging gas, and the game takes place some years after this. The combat system is the focal point, though, as it's basically a combination of real-time and turn-based strategy elements, not dissimilar to Valkyria Chronicles . It's just more complicated and it features a steampunk-like atmosphere.
It's like nothing else out there right now, that's for sure.
Related Game(s): Resonance of Fate