Game concept
Ending Phase
From the game's encyclopedia
An Ending Phase is a special type of Struggle Phase that ends the Struggle when it is triggered. Involved and Interloper Characters can progress towards the ending phase in the normal way, using Catalysts.
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.
Ending Phase is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "An Ending Phase is a special type of Struggle Phase that ends the Struggle when it is triggered." It is part of Struggle. Patch 1.20.1.2, from game/common/game_concepts/03_fp3_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/03_fp3_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.