The volcanism could also act as a "ticking clock"- the volcanism is a relatively new event, the area wasn't active when the evil army was imprisoned in the ice.
With this twist, the party can't just reccomend "stop mining, the trouble will stop." Closing the mine just slows things down. With geysers & outgassing and possible outright lava flows, the ice will continue to melt anyway and the army of evil will eventually be released.
IOW, the ice bought humanity some time, but now a permanent solution must be found.
With this twist, the party can't just reccomend "stop mining, the trouble will stop." Closing the mine just slows things down. With geysers & outgassing and possible outright lava flows, the ice will continue to melt anyway and the army of evil will eventually be released.
IOW, the ice bought humanity some time, but now a permanent solution must be found.