Leo advanced to Stigmata Wizard, conquered the Gnoll World, and developed his Shadow Space while building his academy. He joined Interstellar Wanderer’s expedition to the Marsh World, where two World Lords confronted them over Interstellar Wanderer’s past theft.
Leo and the Interstellar Wanderer conquered Marsh World, defeated its World Lords, and faced the World Tree’s intervention over a rift to Mecha World. After returning to Wizard World, Leo prepared his forces for the coming war against the Returning Breath World Cluster.
Leo fought the Lords of Souls during the campaign in Gran World and secretly sent a soul fragment through the soul passage to Returning Breath World. After the wizard army won, Purple-Gold Vine ordered Leo to prepare for further action because the passage had not been fully blocked.
Leo led the defense of Manluo World, exploiting the battles to harvest souls while killing wave after wave of Lords of Souls. The conflict escalated when the Lords of Souls unleashed the Endless Pot, and two Supreme Lords appeared as the Wizard’s Supreme Lord carried it away.
Leo survived the costly fighting in Gran World, returned home, and evacuated his territory before Returning Breath World's invasion destroyed his academy. After fighting inside the Tower of Elements and accepting Little Bookworm No. 007's demand, he rebuilt and joined a new campaign that left him hunting alongside Blue Dragon Bloodline, who concealed killing intent.
Leo helped defend the dismantling of Purple Gold World as the Body Refinement School used its fragments to destroy enemy worlds. After surviving the Returning Breath World’s counterattacks and returning to his academy, Leo supported Black Soluo’s advancement to level four and observed the descending power of laws.
Leo advanced to Level Five by absorbing a small world's resources and mastering the Black Metal Module, while Black Soluo led the Returning Breath World’s wars. After joining a wizard squad and devastating the forces at Thousand Pools World, Leo prepared for another assault that included a hidden Level-Six Lord of Souls.
Leo defeated the Lords of Souls in several worlds while building Atiya’s forces, but Returning Breath World revealed a trap targeting the Wizard World’s expeditions. As the World Wills began detonating and the surviving wizards faced coordinated attacks, Leo abandoned War Command’s withdrawal route and found the mothership pursued by Lords of Souls.
Leo uncovered the Elemental Wizard School’s collusion with Returning Breath World, freed hundreds of captive Stigmata Wizards, and defeated Black Skull. Returning Breath World surrendered after the counterattack, while Leo settled into occupied territory and a newborn named Baturu received the Barbarian Gods’ blessing.
Leo helped Baturu prepare the barbarians for war while pursuing Alice’s resurrection and expanding his control over other worlds. The arc ended with Baturu leading a vast invasion into three worlds as the Barbarian World Will began to devour their World Lords.
Leo rescued Little Bookworm No. 006 and claimed the Hundred-Page World amid a battle among the great World Clusters. After reaching level six, he built up his forces and discovered the Wizard World was nearing internal war, then accepted Beast Blood Boiling’s challenge over their matching treasures.
Leo defended his academy, moved the Hundred-Page World out of the Crystal Giant World, and joined Baturu in a campaign against the World Tree. The arc ended with Leo binding his shadow to the World Tree’s and entering a battle in the sea of consciousness.
Leo defeated the World Tree, survived two Supreme Lords’ attempts to seize his treasures, and helped the Barbarian World advance into a World Cluster. The fused Hundred-Page World became a refuge for young dragons as Baturu began his ascent to Supreme Lord.
Baturu became a Supreme Lord and led the Barbarian World’s invasion of the Blue Sea Great World, while Leo maneuvered against the Wizard World and prepared Black Soluo’s advancement. Leo’s expedition to Eagle Cry World drew out the Tower of Elements and the Eye of Destruction, who attacked him and destroyed the world, leaving Leo pulled toward the Tower of Elements’ grasp.
Leo and his allies destroyed the Tower of Elements and the Eye of Destruction, then Black Soluo and Baturu led the draining of Returning Breath World. When Wizard World’s Supreme Lords arrived, Leo rejected their offer and faced the Cosmic Wanderer in a battle that left the World Tree under a devastating stellar assault.
Leo rebuilt his forces after the destruction of Returning Breath World, recovered allies, and expanded his army while seeking a way to advance and restore Alice. After a thousand years, he launched an invasion of the Crystal Giant World Cluster to strengthen his power and openly challenge the Wizard World.
Leo conquered the Crystal Giant World, then evaded the Wizard World’s pursuit while preparing for a wider war. After Baturu declared war and the Wizard World mobilized, Leo committed reinforcements and watched the conflict expand.
Leo and Baturu waged a sprawling war against the Wizard World, drawing in the Purgatory Demons and the Myriad Beasts World before launching an assault on the Wizard World itself. Leo surrendered to save Alice’s soul, but the Wizard World assimilated him, and Bloodline Controller later used the controlled Leo to reveal the locations and functions of Atomic Control’s treasures.
Leo returned as a Supreme Lord, seized control of the Shadow Plane, and forced the Wizard World to negotiate with him. He reopened trade under his rules and began drawing civilizations and former allies into his growing sphere of influence.
Leo used the Shadow World to trap the Wizard World’s Supreme Lords while his other body advanced, with the Guardians and Black Soluo protecting him. After ascending, he proposed ending the civil war by taking control of the Wizard World and began proving his strength against Star Truth.