World eventsRaids
11 raids · rolled every 46 minutes · 20% chanceThe game rolls for a raid every 46 minutes and fires one 20 percent of the time, which averages out to roughly one every four hours of play. The roll only picks from raids whose conditions you currently meet, so the list changes as you kill bosses, and most of them need you to be standing near something you built.
That last rule is the one worth knowing: a raid tagged base-only checks for player-built structures nearby before it triggers. Camping in the wild skips almost the whole table. The two that ignore it are the wolf hunt and, in 1.0, Fimbulvinter.
Raids also expire. Each has a fixed duration and spawning stops when it ends, so walling off a chokepoint and waiting is a legitimate answer to every one of them. Nothing here scales with your gear.
Eikthyr rallies the creatures of the forest
90 secondsAvailable from the start, stops once you beat Eikthyr. Spawns in Meadows, BlackForest.
The horde is attacking!
120 secondsAvailable after Moder, stops once you beat Yagluth. Spawns in Meadows, BlackForest, Plains.
The forest is moving...
120 secondsAvailable after Eikthyr, stops once you beat The Elder. Spawns in Meadows, Swamp, BlackForest, Plains.
You are being hunted...
120 secondsanywhere, no base neededAvailable after Bonemass. Spawns in Mountain, Plains.
A skeleton surprise!
120 secondsAvailable after Bonemass. Spawns in Meadows, Swamp, Mountain, BlackForest, Plains, Mistlands.
A foul smell from the swamp...
150 secondsAvailable after The Elder, stops once you beat Bonemass. Spawns in Meadows, Swamp, Mountain, BlackForest, Plains.
A cold wind blows from the mountains
150 secondsAvailable after Bonemass, stops once you beat Moder. Spawns in Meadows, Swamp, Mountain, BlackForest, Plains.
A foul smell from the swamp...
120 secondsAvailable after Bonemass. Spawns in Meadows, Swamp, BlackForest, Plains.
The ground is shaking
80 secondsAvailable after killing any troll and The Elder. Spawns in Meadows, Swamp, BlackForest, Plains.
There's a smell of sulfur in the air...
120 secondsAvailable after killing any surtling and Bonemass. Spawns in Meadows, Swamp, BlackForest, Plains.
You feel a chill down your spine...
150 secondsAvailable after Bonemass. Spawns in Meadows, Swamp, Mountain, BlackForest, Plains.
Fimbulvinter is not on the table above because it does not work like a raid. It has no duration, no spawn list of its own and no base requirement, and it covers all nine biomes at once. It is a world state rather than an attack, and it is tied to the Jotun invasion, which is a persistent site rather than a timed event: up to three can stand in the world at once, they never expire on their own, and each one is the only source of the Malicious Blood that summons the final boss.
You start one by breaking a block of Malicious Ice at the end of a Mörkhalla and you end one by breaking the Black Ice core at its centre. The full mechanic, the invasion's own spawn table and where it can land are on the Fimbulvinter guide.
Raid difficulty tracks the bosses, so the progression guide is the order to read them in, and the bosses page covers the kills that switch each one on and off.