True Realm (Honryō, 本領) is when the wielder’s intent locks with the Enchanted Blade. Chapter 14 titles it. Enten’s True Realm is Magatsumi’s death. Chihiro reaches it first against Sojo, not because he is louder, because he means the cut. Sojo wanted Cloud Gouger to gain slaughter.
Essay: True Realm. Chapter: 14. Sorcery: sorcery.