That’s no moon ...
Two young nobles, enmity between their families. Where have we seen this before?
When a local farmer discovers something at the bottom of his new well, the fate of the land will hang in the balance.
This mountain chain was once vast and impenetrable, but had the misfortune to named in the binding spell of a mighty demonic(godly?) being, namely that when the Great Mountains are forgotten, then shall it be free.
Whilst exploring underground the PCs discover tube like tunnels stretching for miles, upon further inspection the strange tunnels seem to connect all major cities in the are, what is their purpose?