Instructions
Travel to the town of Baroy. Complete the fight against "Blazing Kirin" to receive the blue device. Use water-based attacks to win this fight.
Travel to the ancient factory. Avoid the robots with red defense barriers around them as you will not be able to harm them yet. Smash the broken Mecha Robo at the top of the spiral staircase inside the factory to get the red device.
Travel to Pachess Town underground and defeat the "Scything Skull Spider." For a simple battle, focus your attacks on its helmet until it breaks and then finish it off with "Shine" spells. The green device will be your reward for finishing this battle.
Travel to Noluta village. Defeat the "Azure Sentinel" in battle. This boss has no real weaknesses, so use the strongest physical attacks your party members are capable of to finish the battle and receive the white device.
Travel to Jibral Castle and land on the "Sea Cube" that is floating in the air next to it. Use fire attacks against the "Azure Abyssal Dragon" residing there to defeat it and get the black device.
Approach the treasure barrier wall with the same color as the barrier device you have in your possession to open them.