Instructions
Play through the "Industrial Castle" level and beat the Beefy Brute at the end of the level. He'll yield up the Cardinal orb you'll need later on.
Proceed to the "Full Moon" level. As you fight through this level, you'll come upon small shacks. Use the Cardinal orb in the second shack you come across to reveal the Key Sword. Collect the sword and finish the level.
Proceed to the "Blacksmith" level and enter the Animal Ark. Proceed through the Ark to the door on the far left side. Attack the lock on the door using the Key Sword. After a few strikes, the lock will be destroyed. Open the door to reveal the Beholder orb.
Collect the Beholder to gain your stat boosts.