Game concept
Enshrined
The game also links it as Enshrine.
From the game's encyclopedia
An enshrined Holy Relic at a Holy Site activates holy site bonuses and improves the bonuses it grants, scaled by the total Rarity levels of all enshrined artifacts.
An enshrined artifact is no longer owned by a character, but may be interacted with by the Holder, Top Liege, or Clerical Region holder of the holy site. The artifact will no longer decay. You can enshrine only holy relics for your own Faith; enshrined holy relics of other faiths will provide no benefits.
There may be rewards or costs associated with enshrining or removing an enshrined artifact.
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.
Enshrined is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "An enshrined Holy Relic at a Holy Site activates holy site bonuses and improves the bonuses it grants, scaled by the total Rarity levels of all enshrined artifacts." It is part of Holy Site. The game also links it as Enshrine. Patch 1.20.1.2, from game/common/game_concepts/pam_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/pam_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.