Altered Beast: Guardian Of The Realms GBA

You are the last descendant of the Guardians of the Gates. Zeus creator and ruler of the Guardians of the Gates raises you from your grave! To this end you must go forth and defeat a new unknown evil that has been ravaging various worlds to collect the Keys and essences of each one. Gates are inter-dimensional and interplanetary portals that after being opened with the proper series of Keys allow anyone to travel to any of the infinite planes of existence. A Great Evil (The Dark Reaper) has hunted the Guardians and stolen their Keys and Spirits. Spirits contain the secrets of life on various worlds. Using the Gates The Dark Reaper is building armies and hiding them in many different worlds. It is up to you to defeat these armies recapture the Keys and Spirits and defeat The Dark Reaper. As a descendant of the Guardians you have the ability to imbue yourself with an essence specific to each `Plane'. These essences are called "Spirits." Some Planes have multiple essences and some essences allow for any shape if you have the proper power and can find where to tap into it. By traveling to these other realms and recapturing the lost Altered Beast Spirits and Keys you will gain power hopefully making it possible to emerge victorious against something dangerous enough to have defeated the other Guardians in the first place. Since you are the last Guardian you will become the sole protector of the Keys once you have regained them.