Bone Forging

Bone Forging is the 4th stage of cultivation.
==Summary==
Cultivation at the Bone Forging stage revolves around tempering and forging your bones to make it harder, stronger, more resilient and allows your forged bone to store spiritual qi.
Unlike the previous cultivation realms which require you to open all your meridians, condense all your blood and transform all your tendons, Bone Forging only requires you to temper one bone. Anything past that is optional.
Tempering a bone requires a lot of time, effort, and resources so most cultivators only temper a few bones before trying to attack the next realm.
It could be said that of the five Houtian realms (Qi Condensation, Blood Condensation, Tendon Transformation, Bone Forging, and Meridian Opening), the Bone Forging realm was the one with the greatest combat difference between the weak and the strong. That was something that didn't have to do with cultivation base, but with how many bones you had tempered.
===Bone Tempering Pills===
Bone Tempering Pills are special pills that temper your bone for you, saving you a lot of time and effort. And while they're not expensive enough to be un-affordable, you need to take around 50 just to fully temper a single bone. And Tempering all your bones would require you to take around 10,000 bone tempering pills. This cost isn't something a normal sect can afford, let alone a single cultivator. Due to this, full bone temper cultivators rare and mostly consists of heirs of ancient cultivation clans or the most talented genius from a powerful sect.
==New Abilities==
Illusory Bone Robe: 'An ability specific to Bone Forging experts, that condense a bone-like robe over their bodies to protect it, but was only usable when spiritual qi had been condensed to a pinnacle. 
Illusory Bone Armor: A much stronger version of Illusory Bone Robe, which requires tempering at least four bones, where a bone-like armour is condensed instead of a robe. Although they looked similar, the defensive strength was incomparable, but like the Illusory Bone Robe, the Illusory Bone Armor was a kind of defence only usable when spiritual qi had
been condensed to a pinnacle. In addition, it is noted that not just anyone was truly capable of using this armour in battle. Only top experts were capable of it.
==Celestial's Special Treatment==
Celestials are the favoured children of the Heavenly Dao. When a Celestial breaks through the Bone Forging Realm, a special heavenly tribulation will form that automatically baptize and temper their bones for them. Due to this, Celestials tend to have full-temper bones.
"There was also a faint jade-like luster over his bones. That was a sign he had entered the Bone Forging realm. After entering the Bone Forging realm, a person's bones would begin hardening, becoming harder than steel.
Furthermore, the bones would become a separate reservoir of spiritual qi. That spiritual qi was compressed to an even greater degree and could be released to activate an even greater power."
==References==