Upgrade Your Character Regularly
As you obtain Phozon Prisms in Odin Sphere Leifthrasir, you’ll unlock even more skills in your skill tree. However, it’s a good idea to focus on a select few skills that cater to your play style. Once you’ve chosen two or three skills that you want to use for a particular character, save up your Phozons to upgrade those skills. You’ll get big attack and PP bonuses from upgrading, and this will help you greatly in later chapters for each character.
You’ll also have ability points, which are used to upgrade existing character abilities. I recommend getting the perks that increase your HP recovery rate during the early game. Once you’ve gotten used to the gameplay, it’s also a good idea to get abilities that increase your guard capability and counterattacks. These will help you a lot in later chapters, where it’s wiser to guard enemies and watch their movements before striking.