The Settlers: Heritage of Kings - Expansion Disc is the first add-on for Heritage of Kings: The Settlers.
After the defeat of Kerberos, the old empire flourishes under the rule of King Dario and finally the dream of peace and prosperity seems to come true. But far in the east of the old empire, on the shore of the river Nhern, a bridge is being build. A bridge to the legendary old lands of Hen Brughs. But as the impressive structure grows and grows, the fear of the workers also increases. They see strange, shadowy creatures roaming on the other side of the river. Watching every move the builders make and waiting for them to come. Always surrounded by a fog that seems unreal and very cold.
At last King Darios decides to take matters in his own hands. With his comrades he enters the fog and soon realizes that he has stepped right into a war. A war whose end may mean the destruction of a whole civilization.
Besides the new campaign, the add-on also includes several new single- and multiplayer maps as well as three new heroes like Kala, the witch of the Fogpeople. She can create a poisonous fog which damages every unit around her. There are also four new technologies waiting to be researched at the academy. One of them, mathematics, is needed to create the new structures the game introduces: bridges.
After researching the technology and building a house for the architect, he can be send to a pre-defined point on the map where a bridge can be build. The architect will then prepare the place for construction and prepare the plans for the stone bridge. But once he is finished preparing it, every player can come in and build the bridge. Whoever brings the resources the fastest to the building place, will construct the bridge. Once a bridge is complete, everyone can use it and only the thief knows how to plant bombs at the right places to destroy it.
The thief himself is recruited in the new tavern which also trains scouts and is an additional source of food for the citizens. The third new player structure is the weapons shop where the player can train and upgrade light and heavy sharpshooters. The players can also now find so-called mercenary quarters on the map. There they can hire, for a good amount of gold, units like the thief without the need of having the corresponding building themselves.
The last addition is a powerful map editor that allows the players to create own maps and even complex missions with the script-language LUA.