A One more (spelled as "1 more") is a recurring element in the Persona series from Persona 3 onward.
When an ally or enemy Downs an opponent, usually by striking that opponent's elemental weakness or lands a Critical hit, they are able to gain an extra turn. This can lead to multiple 1 More!s if they continue fulfilling the necessary criteria, until either all enemies are knocked down (in which case it can lead to a Hold Up or an All-Out Attack) or they cannot hit any more weaknesses on opponents that are not knocked down.
If the protagonist switches Personas, they cannot switch Personas again in a "1 More!"
Persona 5 / RoyalEdit
In Persona 5, if "One More" is activated, the user will have the ability to pass their turn to another ally, activating Baton Pass, strengthening their attack and recovery power.
In Persona 5 Royal, as there is now the chance to down enemies through Technical damage, it will also subsequently activate One More. If the party's Technical rank is maxed out, Technical attacks will always Down, guaranteeing a One More in succession.
Certain traits can only be activated while the user is under the effects of 1 More: Cold-Blooded will boost the user's chances of inflicting Freeze, Bolstering Force increases the user's Attack power by 50%, and Grace of the Olive nullifies the HP and SP cost of skills to 0.
Persona 4 Arena / UltimaxEdit
In Persona 4 Arena and Persona 4 Arena Ultimax, a "1 More" refers to a roman cancel, which is a way to end recovery of a move. It costs 50 SP.