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Yvnei was a Monster not originally born in the Dungeon made by the Dragon God of Thunder Nyzzet, but she was originally a young feather winged Wyrm that came from Vast Plains, escaping from the humans and the strong beasts that roamed the place.
Her origins were uncertain, as she had once belonged to a large flock of her race, which was shunted down by Human Adventurers to complete several Quests made by the guild of the Town near the Dungeon.
Yvnei still remembered the day her family was mercilessly slaughtered, even when they tried flying away, the Adventurers possessed strong magic and long-ranged attacks, annihilating them from the sky.
Yvnei had somehow managed to escape alive, mostly because she was shielded by her father…
Although she was greatly affected, she chose to fly away and then enter the dungeon to find shelter from the humans.
Check "The Protagonist's Sister Is Actually the Strongest"!