Bay Law City was a city of green under glistening sunlight. The green creepers had wrapped around the walls so tight that the walls' original color could no longer be seen.
"Throughout the years, druids on their verge of death would violently rip out the poison creepers from their body and place them onto the walls to guard it until eternity!" Count Hutt saw the surprised look on Abel's face, so maybe it was the first time he came to Bay Law City.
Each of those poison creepers belonged to a druid because poison creepers were not a creature of this world, they could only be summoned.
If he wanted to break those walls, he must first penetrate those scary poison creepers. It would be a huge sacrifice.
Poison creepers might be living inside the walls and only exposed a part of themselves. It was very hard to destroy them at once, and its poison was the hardest elemental attack to counteract in this world.