Power System: This is not entirely unique, but I try to make it without any major disadvantages. Martial arts and Immortal cultivation are combined in this system. The first few levels are usually described as Martial arts, but there is no clear boundary between martial arts and immortal cultivation. Usually, saying that someone is a cultivator means that they have condensed a foundation. Everything before that is Martial arts, though there is not special significance to building a foundation.

Realms:

1st: Body Refining

2nd: Qi Condensation

3rd: Qi Refinement (125 years of lifespan)

4th: Qi Transformation (150 years of lifespan)

5th: Meridian Opening (250 years of lifespan)

6th: Body Transformation (400 years of lifespan)

7th: Innate (600 years of lifespan)

8th: Foundation Building (1000 years of lifespan)

9th: Purple Palace (2000 years of lifespan)

10th: Golden Core (5000 years of lifespan)

Obviously there are realms beyond this, but this the limit of the MC's world. In order to progress further, you would have to ascend beyond the realm.

Fate Value: How important a person is, as defined by the Heavenly Dao.

0-10: Ordinary person.

11-100: Minor achievements, usually a martial arts master, or possessing extraordinary skills.

101-200: Having achievements noteworthy anywhere

201-1000: Protagonist level, or characters closely related to protagonists.

1000+ won't exist anytime soon.