Without the complete Arcane Ring, Leon would never be able to attack the Archmage realm in his life.
In fact, in order to look for the trail of the complete Arcane Ring, Leon went to countless planes during these past few years. After so many years, he had yet to make any progress, and only learnt that the Gaugass King's magic inheritance might be hidden in the depths of the Tulan Mountain Range. But that was a huge place, how could he find it? He almost gave up a few times...
A few months ago, he guessed that this mysterious distant cousin was going to the Tulan Mountain Range and thickened his face to follow him. In reality, he had to bolster his courage whenever he was facing this distant cousin, especially when he remembered the crazy actions his cousin did, such as killing three Elders of the Merlin Family, or crippling Aube.
Now, as he was holding the Arcane Ring's magic inheritance, Leon felt that this was surreal and everything was a dream.