Date- -/-
Time- -/-
Location- Unknown, Blood Rule Source
Ruler-Class was a title given to beings in the myriad realms closest to achieving transcendence. The Librarian of the Infinity Library, the stupid Elder Anesthesia Dragon that Wyatt just met, and the asleep blood rule slaves were the perfect examples of Ruler-Class.
As for the Devil Merchant Code, the sentient spell, there was doubt surrounding its actual realm, if it had not achieved transcendence by now, then it should be the being that was very likely to achieve it and worthy of the title of strongest under transcendence.
Meanwhile, Demigod Norley, Field Marshal Heatsend, the Southern Ruler, and the Masters were only the closest to achieving transcendence in the Card World. A devil of Belphegor's level was able to give them a challenge for their money, let alone the Librarian, the stupid Elder Anesthesia Dragon, and other ruler class beings. They could not hold a candle against them.