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Only Halberd, Brunhild, and Sol had come with me for the tree thingy. But the rest of the giants easily saw an enormous tree pop out of thin air. Many of them had never really seen one in real life and had only heard tales about how trees were. I had simply created a Lesser Yggdrasil Seed by spending 100k MP. It wasn't so hard but it has some sort of weird cooldown, I can't make them consecutively and need to wait over a day to create another one. But still, I do have the slight plan of fill the world with these highly durable trees that fill everything with nutrition and life so this world can heal little by little.
Check "The Protagonist's Sister Is Actually the Strongest"!