The Eversmoking Ring of Sulfur is in the hands of the one enemy hero. Once again, you are in no rush to get through this mission. Have Sandro build an army, gather the resources from the southern area, and then head to the tunnel. Defeat the hero there to get the Eversmoking Ring of Sulfur. Defeat all enemies without losing a single battle.
Every player has one town and one hero.
Both Gates are underground and are needed to get to the final town. Have Sandro clear the immediate area and then head underground. Here he can collect every kind of resource, which he should. He should then return to the underground and enter the northern monolith. H should return underground and then go to the southernmost monolith.