Game concept
Unrestricted
From the game's encyclopedia
Unrestricted is the highest level of Dominance. This level can only be obtained by one Character in the entire game, and they will become the Greatest of Khans.
Independent Rulers may use the Become the Greatest of All Khans and Reform the Great Khaganate Decisions
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.
Unrestricted is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Unrestricted is the highest level of Dominance." It is part of Dominance. Patch 1.20.1.2, from game/common/game_concepts/mpo_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/mpo_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.