Game concept

Strife

The game also links it as Strife Opinion.

From the game's encyclopedia

Strife is an Opinion penalty for fellow Vassals.

Strife occurs when a subject of the Liege takes an action against another Vassal. For example, Diarch uses their Borrowed Powers, or in Mandate events, as the Diarch does not have the same authority as their Liege

The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.

Strife is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Strife is an Opinion penalty for fellow Vassals." It is part of Power Sharing. The game also links it as Strife Opinion. Patch 1.20.1.2, from game/common/game_concepts/04_ep2_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.

for a guide, post or blog

Source: game/common/game_concepts/04_ep2_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.