i have a small suggestion here and i don't know if it's already here or not because i haven't tried that yet ....
changing cultivation from Demon to sage would instantly change the whole skills from demon to sage or sage to Demon so you don't have to buy all the skills allover again and buy all the Morai and Primal skills so if you already have all the Demon skills and change to sage all the skills would automatically change to sage that would help people who made wrong choice of their fairly or want to Test Demon/sage and decide what's better for their playstyle
i also don't find any advantage in this so no one will QQ about it unless these people who already has Demon and sage of each class already but i would love to make it easy for people to get the stone to change fairly maybe make it 20-30 Gold which is around 500 EC . not free from God's Giving but the whole skill set will change if you already have the skills . besides only people who would change is the ones who did a wrong choice or want to try another cultivation/skills .
- another suggestion which would be good and support the server and won't make any unbalance or a big difference is Duel Cultivation/fairly so people can DONATE for duel Fairly and have both Demon and sage skills ( but the skills/buffs have to share cooldown of course )