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path of magician focus on cultivating their inner mind and gathering energy called mana, with their inner mind that has been strengthened they can know how everything in this world happen by principle and law, they magician can use that for themself and other they demonstrate by using magic consuming their mana, the stronger their inner mind they can know faster and better about principle and law but to use that principle they have to use their mana.

path of dou fighter focus on strengthening their body, they use Dou Qi that produce by their with dou cultivation art to make dou qi, it similar to cultivation but different because dou qi fighter focus on strengthening their body and they use Dou art as tool to fully use their power, the stronger your body the stronger your dou qi and more abundant rumorly one can dry ocean by using fire dou art with enough dou qi.

path of cultivation it focus on their Spiritual Qi, mind and body it has many advantage but simiarly it had disadvantage to, for Cultivator they have to use effort more than the other two path to become stronger because of that only minority become Cultivator but Cultivator can use every art that is their advantage of course with enough foundation they can be stronger than their respective Realm.

for Realm the other path has, it Will be gained as the story goes one for now

Cultivation Realm:

Tempering Realm

Condensation Realm