Some of the Sins Dungeons were recent, like Avarice being recognized a few years ago. However, others were ancient and as old as the nations they inhabited. Furthermore, each dungeon had a different layout.
For example, Avarice was the dungeon of greed, filled with riches and hidden treasures. It was systematized for a dungeon with layers that could allow someone to go toward the first layer if they were just Rei-rankers, the second if they were Vetus-rankers, and the third if they were deme-rankers like Arthur's party. Astra-rankers could only challenge the fourth and fifth. Therefore, the White Fangs failed to clear it.
Even though it was better than most dungeons in that regard, Avarice still had the most severe accidents to entries ratio. Most awakeners would overestimate their abilities and allow greed to blind their judgment, killing them in action.
