The three trials left by the Predecessor Civilization Alliance correspond to the legacies of three civilizations and also to three aspects of combat.
The Furnace Man Trial ensures Richard's foundation, preventing him from being troubled by a lack of insight during battle. The Titan Trial ensures Richard's combat power, allowing him to flexibly apply the knowledge he learned from the Furnace Man legacy.
As for the final Supreme Trial, it is meant to supplement Richard's will and spiritual power.
Willpower may sound mysterious, but it is quantifiable.
The Supreme has divided willpower into four levels: Coward, Ordinary, Elite, and Hero. To complete this trial, Richard must reach the Hero level.
Standing before the Dimensional Incarnation, Richard felt his fighting spirit surge.
He was confident that his willpower was reasonable and his convictions were strong. Although he didn't expect to pass the Supreme Trial in one go, he believed that with multiple attempts, he would succeed.