Game concept
Mitigate Fragile Bones
From the game's encyclopedia
While it's not possible to prevent Fragile Bones from progressing, you can prevent large Trait Path increases by:
• Avoiding Travel and Activities
• Avoiding Commanding Armies
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.
Mitigate Fragile Bones is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "While it's not possible to prevent Fragile Bones from progressing, you can prevent large Trait Path increases by:" It is part of Elder Health Traits. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.