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I always knew these twins had more than they thought they held. They always believed they could only call forth the strength of Desert Spirits. And well, in an environment filled with desert, that's indeed the case. However, spirits are beings that inhabit every element. Once a certain element is in large quantities, they'll emerge, embodying the element itself.
They think they can only use desert spirits because that's what they have around them… But of course, that's not really the case on its totality. Once the enormous terrain of ice and then the one of fire erected, the spirits of these elements quickly swarmed the place.
They simply needed some more Mana, a little push before fully unlocking their actual and truest potential. Now, they finally found it. A Spirit Mage doesn't simply wield a single spirit's power, they have the power to call forth the spirits of many elements, of the world as a whole.
Check "The Protagonist's Sister Is Actually the Strongest"!