The Longhouse is a creature dwelling of the Stronghold in Heroes IV. It is one of the most basic structures that can be built in a Stronghold, and in many cases a town starts with this structure already erected.
Like all dwellings (and most buildings), the Longhouse can only be built if the Fort was constructed beforehand. The building itself is very cheap, costing only 1,500 , and has no other prerequisite.
Most towns start with the Longhouse already built, but when your town doesn't have the structure from the beginning, it is recommended to construct it early. The services of the troops you will enlist at the Longhouse will prove very useful.
The Longhouse provides 19 Berserkers per week, or about 3 per day. This will lead to relatively high numbers of Berserkers, and they are a force to be reckoned with even in later stages of a scenario, thanks to their sturdiness and their offensive power.
Longhouses can also be encountered on the Adventure map. These structures work the same as the in-town variants, and provide Berserkers for recruitment. The number of creatures grow daily, and can be recruited either by sending an army (hero or creature) or a caravan to pick the troops.
It is strongly advisable to recruit Berserkers often and not let them accumulate in an external dwelling, because an enemy can very easily flag your structure and recruit the creatures; the unrecruited Berserkers will not defend the Longhouse. Additionally, it is always the risk that a wandering monster will move near to your dwelling (wandering monsters have a tendency of guarding structures, even if those structures are owned by a player). This will make it more difficult to recruit your creatures, as any unit can block a caravan.