United Warfront

United Warfront is a game mode in Fire Emblem Heroes.

Overview

Players engage in a series of five consecutive Legendary Hero Battles in similar fashion to Arena Assault. Players first must create a proxy team composed of any four Heroes in their active roster for other players to use.

Before each battle, the player is given three random proxy teams of other Heroes players to use in an immediate battle. Once chosen, the player is immediately given a set Legendary Hero Battle and all difficulties are available. Players may immediately begin battle with their selected ally team at their desired difficulty. Alternatively, players may swap up to two characters in the team with characters in their own roster. If the player's swapped character is from the same title as one of the teams Heroes on the ally's team, both those units gain 10 HP and a flat +4 to their four core stats.

Completing a battle grants rewards based on difficulty with higher difficulties rewarding all cumulative rewards for the lower difficulties. Once a unit has been used for these battles, regardless if it was on the proxy team or the player's swapped in Hero, that Hero can no longer be used for the rest of the run. Players may suspend this game mode or surrender between battles similar to Arena Assault.