Aside from this, there's another embarrassing issue.
Casio doesn't know the way.
The Devil's Book showcases a map with only a rough location of the Akaba Ruins and a route through them. However, the expansive Alfama Mountains are hard to navigate, and finding the ruins would likely take a lot of time.
During his last Retrospection, Casio entered the mountain amidst heavy mist, guided by a strange dark shadow.
Upon leaving the ruins, he only remembered the route from the exit to the Blood Clan's longevity blood sacrifice site.
At the time, Casio and Duomeng were being chased by the holy beetles, quickly leading them astray and ducking into the woods to descend the mountain under the cover of darkness.
