What Caused the Mana Disaster in Mushoku Tensei?
The mana disaster happened because of a mysterious artifact called the Divine Teleportation Circle. It malfunctioned during its activation.
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The mana disaster in Mushoku Tensei was caused by a failed summoning experiment by the powerful mage, Orsted. He tried to summon a hero, but instead triggered the catastrophic event.
Hot take: Blame it on the plot device. Seriously, though, it was Orsted's meddling with the summoning magic.
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