Ys IX: Monstrum Nox Patch Improves PS5 Backwards Compatibility Before Western Launch

Ys IX: Monstrum Nox, the latest mainline entry in the Ys series, has been updated to version 1.01 before its official western release tomorrow.

For those unaware, Ys IX: Monstrum Nox’s base 1.00 version has a horrendous crashing issue on PlayStation 5. In my experience, there are two types of crashes that occur. There are consistent crashes in particular sections of the game when playing with the English script. Switching to the French script remedies these consistent crashes for whatever reason. This did not ruin the experience for me as I saved often, but it was definitely rather worrying to contend with. There were no crashing issues I experienced when playing this title on PlayStation 4.

Additionally, there are also random crashes that had little rhyme or reason. I found these crashes to occur more frequently when autosave was enabled.

I listed all of the consistent crashes I encountered when reviewing the title and tested most of them during the 1.01 update. Thankfully, none of the consistent crashes I tested occurred, so it seems as if NISA has directly addressed the poor optimization for PlayStation 5. I can not vouch for the random crashes’ consistency since it is difficult to test such a thing, but the game has not crashed for me yet, which is a positive sign.

I can also not guarantee that all of these crashes have been fixed entirely, but they seem to have been remedied, at least so far.

Ys IX: Monstrum Nox is a truly stellar game, so these crashing issues potentially being fixed right before the official launch is fantastic work on NISA’s part and will serve to enhance players’ experiences. I want to extend my thanks to the team that swiftly tackled these crashing issues.

For those curious, I will list all of the consistent crashing spots below. There will be no story spoilers, but if you want to avoid all preemptive knowledge of the title before playing, I advise you to avoid viewing the notes below. I still advise caution when playing the title with this update, as it could have potentially initiated new issues. Save frequently and disable autosave if you do not mind lacking that functionality.

  • During the cutscene leading into the forced raid fight in Chapter 3, the game consistently crashes.
  • During the sidequest called Prison Rescue, the game crashes right before reaching the quest’s final scene. It’s right after you use the Crimson Line ability.
  • During Chapter 5, the game consistently crashes during the main story scene at the Coliseum area’s receptionist hall.
  • Using the warp point on the far south area of the world map near the dungeon always crashes the game.
  • After defeating the final boss, the second cutscene that plays afterward has a consistent crash.

Ys IX: Monstrum Nox is releasing for PlayStation 4 on February 2 for North America and February 5 for Europe.

You can also check out our review for the title here.


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Orpheus Joshua

Random gamer equally confused by the mainstream and the unusual. Fan of JRPGs, Action, Platformers, Rhythm, and Adventure titles.