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Where to find in story mode:
Land 1, Land 2, Land 4, Land 5
They are often the first Tribe of the player. Also, the player is probably a Norse god in general, because in the first cutscene he/she is born out of Norse prayer.

Buildings:
Norse have a good set of building, from small huts to big houses for a lot of people.

Wonder bonuses:
Wood Miracle (gives more resources)
Food Miracle (gives more resources)
Water Miracle (puts fires out faster)
Strength Creature Miracle (longer duration)
Also increases the amount of food that villagers gather while fishing (passive).

Opinion:
Probably the strongest tribe. Resource based Miracles are the most useful ones and can be found on many lands. Passive bonus to fishing also helps with resources (keep in mind that with a too small Tribe Power it may cause problems and work like a debuff). This all can lead to a very fast expansion, huge villages and a lot of people worshipping. Looking at all this, it sounds a bit weird that the Norse are using Celtic music and do not have their own. How is that even possible for the most used Tribe in the game?

Norse Tribe Music: