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The Venomous Wyvern Nest was located very close to the southeast area of Agartha's walls, really well hidden between a lot of tall trees, and beneath the wall's shadows. It was certainly hard to find them, especially because Venomous Wyverns were also nocturnal creatures. Thankfully the city by itself already had a magic barrier through the improved wall I made, which was then further enhanced thanks to mom and the alchemists she contracted.
So despite wanting to, the Venomous Wyverns can't get inside and begin stealing people that wander at night or something. However, it's a different story for the people that goes to hunt outside, such as Hunters, Adventurers, Explorers, or anything.
They could also become a threat to any people that get here through the road. Their appearance was only detected recently though, like a week ago, so it's better to get them out of the picture before they worsen the security of Agartha's outskirts.