Game concept
Artifact
The game also links it as Artifacts.
From the game's encyclopedia
An Artifact is a noteworthy object that provides bonuses to the Character who uses it.
Artifacts are divided into two categories:
• Inventory Artifacts are worn or carried by a Character
• Court Artifacts reside inside of a Ruler's Royal Court
Some Artifacts are more special than others, and have a higher Rarity
Just like with Titles, Characters can get Artifact Claims on an Artifact, and try to take that Artifact for themselves.
Artifacts also have a Durability: when it reaches zero, the Artifact is destroyed.
Artifacts are always inherited by the owner's Player Heir. If an Artifact is inherited by someone who is not a Close Family Member, it will lose Durability or even be destroyed outright.
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.
Artifact is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "An Artifact is a noteworthy object that provides bonuses to the Character who uses it." It covers Artifact Rarity, Artifact Claim, Artifact Durability, Inventory Artifact and Court Artifact. The game also links it as Artifacts. 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.