Game concept
Seek Antipope's Indulgence
From the game's encyclopedia
An Interaction available to anyone following a Challenger Head of Faith. Pay Gold to your Antipope for forgiveness and Piety, bypassing the Mainline Rite Head of Faith. Their sponsor is accepted automatically.
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.
Seek Antipope's Indulgence is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "An Interaction available to anyone following a Challenger Head of Faith." 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.