How to complete a campaign?

Basically, I played a campaign a long time ago, but I don't remember the name. I'd like to know the walkthrough and the name of the campaign. I'm stuck in one place and can't seem to get out. I'll describe the campaign: Mission 1. You need to visit the only obelisk, in the center of the map on an island behind a bunch of gold golems, which immediately unlocks the Grail. It's Castle versus Fortress. Mission 2. At the very beginning, there's an artifact guarded by thousands of peasants. And in the center of the minimap, on the "grass," the word "ALEXIS" is written in a snowy landscape. How do I get off the island and into the Dungeon?