You can open this seal only after you have opened up all the other seals. Doing so will start a battle event with the Golden Knight. The Golden Knight will appear to fight you. Just continue attacking, and heal or defend when he tells you to. Eventually you will be able to use Ultimate hit. Do so and this battle is yours. You will receive the following: * Age of the King (Power 420) * King Ring (Critical Up Level 3, Instant Death Effect, 8x GC Damage)