Ys IX: Monstrum Nox
- Flash Guard is incredibly overpowered. Not only does it negate damage from any source, it buffs your damage. You can even re-guard during a longer attack like a flamethrower.
- Side quests listed as "short" need to be done immediately or they'll fail. Those and "people entries" in the Journal are the only missable content in game.
- Creating a save file when you hit a restore point (telegraphed boss fight) will save you from progressing too far and failing, but there's no easy way to tell you missed a character note.
- You'll have to be thorough in checking the local map in the districts and revisiting your home base if you're trying for completionism