Dead or Alive
Luna nodded in satisfaction after seeing the five Celestials praising the potions that Vincent had given. Well, she expected this much since she was also captured by Vincent through this method.
As far as they know, only the Mystic Link Serum was the type of drug or medicine capable of providing Celestial Energy to them. This is the only artificial method that they have aside from consuming the Blood Essence of Mana Practitioners.
However, because the machines needed to create these serums were already broken during the many wars against the other species, they thought that it was already impossible to recreate this serum.
The potions that they received were basically something that none of them had ever thought to help them recover their energy.
This is why the five Celestials were highly doubting their claims at first which even led to an argument.