Your third spark comes from your first fairy, so whether you were Master or Celestial, you would still have it. The main difference between Master and Celestial is whether you can use your 100 skills from your class, if you have them.If you had Celestial Demon from the boutique item previously but are now Master of Discord, did you accidentally do a lower cultivation? If you are switching between Sage and Demon, you must complete all of your culti quests, even if you used the boutique item.
I bought the 3rd demon fairy from the boutique months ago and have not done any lower cultivations. As for the level 100 skills I can still use them all with no problems. The only Spiritual Cultivation in Available Quests is Celestial Demon.
Depending on where you left your 99 cultivation, if you picked up a quest by accident, it will reset your cultivation from Celestial Demon. That's the only thing I can think of as to why your cultivation would reset from Celestial down to Master of Discord.
If that was the case then I wouldn't be able to use any of the level 100 skills and like I was saying I can use them all with no issues
if you have already learned your 100 skills you could still use them regardless of the cultivation. if you tried learning them now then you wouldn't beable to. Are you sure you didn't pick up any other cultivation quest? Cause thats the only way the cultivation would lower itself.