What is the default Scandinavian Adventurers game rule in CK3?

Frequent: Scandinavian adventurers will try to target Russia and the North Sea every 5 years. (patch 1.20.1.2)

Does changing the Scandinavian Adventurers rule disable achievements?

Yes for “Rare” and “Off”: the file gives them the flag blocks_achievements. The other settings keep achievements on.

Game rule · Difficulty · Historicity · Flavor

Scandinavian Adventurers

The Northern Lords (by the code in its key)

Rare ✕
Occasional
Frequent · default
Apocalyptic
Off ✕

Scandinavian Adventurers is a game rule in Crusader Kings III (Difficulty, Historicity and Flavor) with 5 settings: Rare, Occasional, Frequent (the default), Apocalyptic and Off. “Rare” and “Off” disable achievements. Patch 1.20.1.2, from game/common/game_rules/00_game_rules.txt.

This section as JSON: /raw/game-rules.json

Quick answers (2)

What is the default Scandinavian Adventurers game rule in CK3?: Frequent: Scandinavian adventurers will try to target Russia and the North Sea every 5 years. (patch 1.20.1.2)
Does changing the Scandinavian Adventurers rule disable achievements?: Yes for “Rare” and “Off”: the file gives them the flag blocks_achievements. The other settings keep achievements on.

5 settings

Rare
Disables achievements
Scandinavian adventurers will try to target Russia and the North Sea every 15 years.
The script checks it once, in 1 place
Events 1
- fp1_scandinavian_adventurers.0001
Every has_game_rule = fp1_scandi_adventurers_rare in game/common and game/events, by the top-level object it sits in.
fp1_scandi_adventurers_rare
Occasional
Scandinavian adventurers will try to target Russia and the North Sea every 10 years.
The script checks it once, in 1 place
Events 1
- fp1_scandinavian_adventurers.0001
Every has_game_rule = fp1_scandi_adventurers_occasional in game/common and game/events, by the top-level object it sits in.
fp1_scandi_adventurers_occasional
Frequent
Default
Scandinavian adventurers will try to target Russia and the North Sea every 5 years.
The script checks it once, in 1 place
Events 1
- fp1_scandinavian_adventurers.0001
Every has_game_rule = fp1_scandi_adventurers_frequent in game/common and game/events, by the top-level object it sits in.
fp1_scandi_adventurers_frequent
Apocalyptic
Scandinavian adventurers will try to target Russia and the North Sea every year, AI characters do not require specific traits to launch Varangian Adventures.
The script checks it 4 times, in 3 places
Events 1
- fp1_scandinavian_adventurers.0001
Script values 1
- viking_conquest_ai_score_value
Casus belli 1
- Varangian Adventurer
Every has_game_rule = fp1_scandi_adventurers_apocalyptic in game/common and game/events, by the top-level object it sits in.
fp1_scandi_adventurers_apocalyptic
Off
Disables achievements
Scandinavian adventurers will never try to target Russia or the North Sea.
The script checks it once, in 1 place
Events 1
- fp1_scandinavian_adventurers.0001
Every has_game_rule = fp1_scandi_adventurers_off in game/common and game/events, by the top-level object it sits in.
fp1_scandi_adventurers_off

Source: game/common/game_rules/00_game_rules.txt line 1182 (key dlc_fp1_scandinavian_adventurers), modifiers from game/common/modifiers, names from the English localisation; Crusader Kings III 1.20.1.2. The DLC is our reading of the code in the rule's key: the file's own dlc lines are commented out.