Persona 3 Reload --- Battle for Everyone's Souls ~ Remix 

"Entrusting his future to the cards, he clings to a dim hope."
"Yes, the Arcana is the means by which all is revealed..."
"The Battle for Everyone's Souls" is the battle theme for Nyx Avatar, the first phase of the final boss of Persona 3. Having been released after defeating all of the Arcana Shadows, Nyx is prophesized to bring the end for humanity, and has fused with Death itself to do so. it has a whopping 13 phases, each based on the first 13 Major Arcana (besides from the Fool) and having large amounts of HP. This is the last battle in every version of Persona 3 that is not scripted with the exception of "the Answer", an epilogue available in Persona 3 FES and DLC for Persona 3: Reload.
Persona 3: Reload is a remake of the third mainline game in ATLUS' "Persona" franchise, which itself is a spinoff to "Megami Tensei". Although the games are easier than Megami Tensei, they still have an enjoyable level of challenge and I highly recommend any game in the series to someone who likes to play long, challenging videogames.