Game concept · The Northern Lords
Designate Chief Sacrifice
The game also links it as Designate a Chief Sacrifice, Chief Sacrifice.
From the game's encyclopedia
When holding a grand sacrificial festival, Characters may designate one of their Prisoners to be the primary sacrifice. This Prisoner is killed first, and may cause the sacrificing character to gain more Piety.
Preferable sacrifices are:
• Landless Characters whose Faith is either hostile or evil
• Landed Characters of at least Count-Rank
• Heads of Faith (though this may have repercussions)
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.
Designate Chief Sacrifice is an entry of Crusader Kings III's in-game encyclopedia (The Northern Lords). The game explains it: "When holding a grand sacrificial festival, Characters may designate one of their Prisoners to be the primary sacrifice." The game also links it as Designate a Chief Sacrifice and Chief Sacrifice. Patch 1.20.1.2, from game/common/game_concepts/01_fp1_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/01_fp1_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.