Ever since the Zorvans descended and began attacking Eldoralth, after suffering incredible losses, each race on the planet banded together to form a singular alliance to fight back against them.
The alliance consisted of truly powerful individuals from all the different races. However, due to the extreme tension caused by the earlier wars, the distrust between them was palpable.
None of them trusted each other.
Despite having no choice but to form the alliance, internal conflicts were common.
Some chose sabotage.
Others resorted to outright betrayal.
Because of this, the heads of the alliance reached a consensus: mana contracts.
The leaders of each race were obligated, mandated, to sign a mana contract. The term leaders wasn't limited to the singular rulers of their respective races but extended to their powerhouses, those with the power to cause irreparable change.
In simple terms, paragons.