Game concept

Battle Roll

The game also links it as Roll, Rolls, Advantage Roll, Advantage Rolls.

From the game's encyclopedia

Advantage Rolls are made by each Commander during Battle. These are done on a scale from 0-10 and are completely random, but can have a decisive effect on the outcome of the Battle.

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.

Battle Roll is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Advantage Rolls are made by each Commander during Battle." The game also links it as Roll, Rolls, Advantage Roll and Advantage Rolls. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.

for a guide, post or blog

Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.