But very soon, several mage organizations realized their disadvantage. If they didn't purchase the Blue Demon Potion on a large scale, their opponents would be stronger than them. If their opponents who should've been as strong as them had twice as much mana as they did, how could they possibly win?
When they explored relics, they might have to quit halfway due to the lack of mana, but their competitors could continue after taking the Blue Demon Potion, and find all the treasures.
When they conquered a plane together, and agreed that the territory that each party occupied would belong to that party, their competitors suddenly accelerated the conquest, as if they had taken exhilirants. In only a month, their competitor's territory might be 25% bigger than theirs. For a plane, a 25% difference meant the area of a grand noble's territory, or even part of a kingdom.