Disasters occur randomly, they are marked by an Icon on the calendar to give you time to prepare. They are usually announced 3 months before they occur.
Map: Ragnarök only
During one month, attack of all units outside of their territory is increased by 50%. This event never occurs during winter.
- Hard: 80% lost
- Medium 60% lost
- Easy: 20% lost
Rat infestation will also Sickness a certain amount of clan members.
The Kraken roams around Northgard and punishes those who do not fear it, sinking boats and damaging ports. The Kraken attack lasts for 3 months. Kraken attacks can be avoided by stopping the raids before it starts or by building a Lighthouse.
Map: Permafrost only
The sea freezes during winter, preventing all boat-related mechanics: Sailors, Mercenary raids, extra villagers from the Recruits fame bonus, and Thrall purchasing. Drakkars sailing at the beginning of the frozen sea will be immobilized until the end of the winter. This event can happen right after another event, therefore not being announced in the calendar.
Map: Ragnarok only
The volcano will erupt and molten rock will fall on various tiles on the map. The number of molten rocks falling onto your territory will vary depending on the number of tiles you have colonized.
Each rock holds 10 Stone. Unless the player manages to completely mine these rocks within 4 months, Rock Golems will spawn from them and attack any units in the tile. If a rock was only partially mined before the deadline, the Golem will spawn missing some HP.