These buildings are extremely vital and unique to the Exarchate:
1. Altar of Northern Lights - Summons heroes and revives fallen heroes.
2. Exarchate Lumber Mill - Serves as a drop-off point for lumber. Also contains the Masonry, Lumber Harvesting, and Regenerating Icecrete.
3. Icecrown Forge - Contains the attack and armor upgrades for all units, and the Icebound Vitality upgrade.
4. Tuskar Quarters - Trains Tuskar Bruisers and Mystics. Also contains spell upgrades for Tuskar Mystics, Control Magic, and Beastly Endurance.
5. Neldorei Archives - Creates a shop with purchasable items.
6. Igloo - Provides food, which increases the maximum number of units that can be trained.