The empire had demanded Ravenwood to build three Astral Lighthouses as the sole condition for their survival after Terra's conquest. Negotiation was not an option.
"Don't mistake this as a threat, but a declaration. We'll construct a lighthouse on your ashes if you refuse," Great Sage Yeats, the first speaker of the Astral Council, had warned the Forest Elf ruler.
To construct these lighthouses, the empire had destroyed trees, built barriers that hindered growth, used traditional wooden materials for frames, and burned down the forest. The laborers were Forest Elf prisoners of war.
The Forest Elves saw these lighthouses as a symbol of humiliation and conquest. Even today, over 800 years later, few Forest Elves choose to become magic chanters, despite the Astral Lighthouse's magic power initiation ritual being open to them.