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Although the Tai Chi Mysterious Light Array is also a fifth-stage formation, it is just an ordinary fifth-stage, far from the peak of the Tian Gang True Spirit Yin-kill Array, which is at the pinnacle of the fifth-stage.
In the hierarchy of formations, reaching the sixth stage means an Immortal Array; below the sixth stage, there is no half-step division, simply the peak of the fifth-stage. That is to say, with a strong main formation practitioner at the fifth-stage peak, it is even possible to trap and slay a Half-immortal.
With the Tai Chi Mysterious Light Array creating confusion outside, and the Tian Gang True Spirit Yin-kill Array designed to kill on the inside, even a Half-immortal would be deluding themselves if they thought they could sneak in. Such a 'turtle shell' drastically increased Han Yi's sense of security.
Following that, Han Yi went into closed-door cultivation, recovering his mana and the divine force expended within his divine aperture.
