Houtian

Houtian/Xiantian are common cultivation terms. Usually Houtian (后天) refers to the training of the body, whereas once you reach the Xiantian realm, you begin to train in something else, such as a golden core or the Dao. In this novel, Qi Condensation, Blood Condensation, Tendon Transformation, Bone Forging, and Meridian Opening are all realms within the Houtian realm.https://www.wuxiaworld.com/novel/nine-star-hegemon/nshba-chapter-263
The Houtian realms here refers to the five realms that are focused on tempering the body. Those would be Qi Condensation, Blood Condensation, Tendon Transformation, Bone Forging, and Meridian Opening.
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