Happiness

Happiness is determined by the sum of the addition by Happiness Sources, minus Happiness Consumption.

Happiness must be managed carefully, especially on harder difficulties as Unhappiness will cause your population growth to stop and Unhappy units have a -20% production debuff.

The Eikthyrnir Clan can discover the Lore Young and Proud, which will increase Military Units Attack Power by 3% for each positive Happiness.

Effects on the Settlement

Happiness is the factor that determines how fast your Clans population will grow. While Happiness is 0 or above new Villagers will spawn at your Town Hall. The more positive Happiness you have, the faster new Villagers will join your clan.

(Thanks to Steam user "Bow to Gbowee" for the formula.)

Primary Happiness Sources

Brewers or Skalds

• Territory - How many Areas your clan has colonized.

• Food Reserves - Having a large surplus of Food.

+1 Happiness for 500 Food.

+2 Happiness for 1500 Food.

• Geyser Tile - When colonized will grant +1 Happiness.

• Baldr's Blessing - +3 Happiness

Secondary Happiness Sources

• Slidrugtanni

Osmosis - +2 Happiness for every Area with a Fishing Spot, Swamp or Forest within your territory. (Areas with a combination of both, only count for +2)

Greater Blessings + Baldr's Blessing - +5

• Eikthyrnir

Eradication - +1 Happiness per Food Silo

Feeling Safe - +1 Happiness per upgraded Training Camp, +3 if you have a Warchief.

• Huginn and Muninn

Feeling Safe - +1 Happiness per upgraded Training Camp, +3 if you have a Warchief.

Journeymen - Increases your  Happiness based on the areas you have explored.

Exotic Goods - Gain +1  Happiness for every Harbor or +2  Happiness if upgraded.

• Heidrun

Feeling Safe - +1 Happiness per upgraded Training Camp, +3 if you have a Warchief.

• Fenrir

Starting Bonus - +1  Happiness for each pair of military Units. (A single unit does not award halve).

• Bjarki

Protector of the Land - Gain +1  Happiness per Area with at least one military camp.

Winter Festival -  Happiness is increased by +2 during the Winter season

Happiness Consumption

• Expected Happiness

Depends on the amount of Kinsmen in your Settlement and on Difficulty

• We want better houses! - Not having enough upgraded houses

• We want a better Town Hall! - Not having an upgraded Town Hall

• Too many wounded units! (Starting at 4 Wounded Kinsmen)
• We're Freezing! - Not having enough Wood for firewood
• We're Starving! - Not having enough Food
• We're Sick!

References

Pictures and data taken from:

The Viking's Almanac: A comprehensive guide to Northgard