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Raven studied the Last Seal...
It looks like a large bottle cork filled numerous dazzling runes. It is also bound by numerous chains - not just any chains but the Chains of Order. At the center of the last seal, a lone sparkling gem could be found. The gem radiated with rainbow colored lights and was fluctuating with intense energy signals.
This gem served as the core of this Last Seal, coincidentally, it is also the true body of Elder Flame - the Sun Rock.
Beneath this seal is a deep hold filled with darkness. The only light source that could be seen within this darkness was the glow of the Chains of Order that's bound to the body of the Devil Emperor itself.
Since the Chains of Order converge on to the Sun Rock, Elder Flame naturally became an important part of the seal. It can even be said that he's the one keeping the Last Seal intact. Without him, it would be too easy for the Devil Emperor to escape his prison.