Zheng Yi felt the sharpness gradually developing within the huge Stone Sword in the Gourd Temple, which seemed capable of slicing the heavens and earth, his heart slightly shook.
This is incense fire reflecting reality.
The Blood and Flesh Gourd was refined by Zheng Yi using the Five Viscera Secret Technique, into the location of the heart among the five viscera and six bowels, forming a Gourd Shrine. Meanwhile, outside, it condensed the earth, sand, and stones to form a Gourd Temple under Zheng Yi's spell.
Originally, the Blood and Flesh Gourd had nurtured the embryo of a Flying Sword within it.
That was one of the Five Poison Spirit-Slaying Swords.
Though the Blood and Flesh Gourd was re-refined by Zheng Yi and transformed into the heart shrine, the Sword Qi of that Flying Sword did not dissipate; instead, it became more solid, undergoing some bizarre changes.
