In simple terms, it's the upper limit that gets deducted.
Each time it's used, life and soul are consumed to a degree. The more it's used, the more is deducted, and it doubles each time!
The higher you go, not only does rank advancement stall, but it can even drop due to excessive consumption.
As for restraint... such a thing as masses simply doesn't exist!
When it comes to masses, fighting is as common as eating and drinking. There's no thought of valuing peace.
The more resonant you are with the Sacrificial Master, the more you become accustomed and reliant on this power; likewise, you tend to overestimate yourself.
If you're not careful, you can blow yourself up because the impact was too magnified.
Or, you can provoke an unbeatable opponent due to inflated ego and get crushed to death. Even if you win, you might exhaust yourself into an early grave.
During the effect of such gifts, the intense pain can cause the Inheritors to lose their calm and go completely berserk.
