The first stage, Houtian. The lifespan of a hundred years. Same as mortals.
The second stage, Xiantian. The lifespan of two hundred years. Entry-level immortal practitioner. He/she refines qi at this stage.
The third stage, Golden Core. The lifespan of five hundred years. A practitioner gets the ability to fly and use aura attacks.
The fourth stage Wanxiang. Practitioners of this level can use innate 'Manifestations' which is their strongest but most effecient attack. At this level, one will be addressed as Wanxiang Adept. The lifespan of eight hundred years.
The fifth stage, Primal. Can be referred to as Primal Daoist. From this point, a practitioner is not bound by their lifespan. Instead, they have to face tribulation. The number of tribulations varies, but the practitioner is forced to face all of them and advance to the next level or they perish sooner or later. If a Primal's body is destroyed but manages to escape with his soul, then he will become a 'Loose Immortal', whose power is roughly on par with the 'Earth Immortals'.
The sixth stage, Void. Can be referred to as 'Land Immortal', or 'Earth Immortal'. In the later levels of the Void stage, a heavenly tribulation will test them. If they fail, then they will die and their spirits will be extinguished.
The seventh stage, Celestial Immortal. Only at this stage can one be considered to have ascended beyond the Three Realms and no longer be formed by the Five Elements.