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Emeraldine conjured a powerful seal magic. She was able to do that thanks to her amazing affinity with Holy Magic and the help of her Light-Attribute Spirit (Damn, I really want a Spirit for myself as well!). She conjured a ray of light into the Dungeons' entrance which spread out like a white and gold membrane of light, covering the entrance. The toxic miasma stopped coming out of it just like that. After that, she put several seeds around the entrance and with her Nature-Attribute Spirit she made them grow into many roots that began to surround the entrance, reinforcing her seal even more, and creating a wooden door as well.
Check "The Protagnist's Sister Is Actually the Strongest"!