*NOTE: Recommended level is 42.
Obtained: When Touma reaches Stage Rank 11, he will send you a Topic. After you read it, travel to Fortuna Office and speak with him.
After the cutscene, head to the 106 Idolasphere to begin your hunt for Riku Suzumoto. Tiki will send a Topic saying she senses a Performa presence at the very top so teleport to 7F and proceed forward towards the stairs leading up to trigger a brief cutscene. Afterwards, enter through the door and take the stairs to the top to trigger another cutscene. This will begin your boss fight with Cursed Abel (level 44), Regal Knight (level 44) and Regal Myrmidon (level 44). Defeat them all to trigger a cutscene in which Touma earns a new Radiant Skill to unlock. Head on over to Bloom Palace to unlock “Door of Heroes”.