The Spiritual Strength is divided into 4 States/Realms.
1) Mortal State/ Mortal Realm
Alchemist ranging from 1st to 7th rank are in this State/Realm.With luck, some 7th ranked Alchemists may be able to vaguely touch the Soul State.
2) Soul State/ Spiritual Realm
Every 8th ranked Alchemists are in this State/Realm. It's divided into: Initial, Middle and High.
3) Heavenly State/ Heavenly Realm
This is the level of every 9th ranked Alchemists. In this State the soul can become solid and as strong as the physical body. It is divided into: Initial, Intermediate, Advanced and Peak/Perfect. At Perfect Heavenly State, the soul could span for 10 thousand of miles.
4) Di State/ God Realm
The soul can cover hundred thousands of miles. It is relatively easier to achieve this State than making a Di Ranked Pill or becoming a Dou God.