Arena Duel

The Arena Duel is a feature in Fire Emblem Heroes

Overview
Every week, players assemble teams of 4 to battle against the teams of other Fire Emblem Heroes players. Earn points by winning battles and attempt to earn as much points as possible. Based on the player's rank and total score at the end of the week, they can earn Hero Feathers as a reward.

Scoring
Players earn points in various ways, based on numerous factors:
 * Difficulty - Every enemy team is given a rating score based on the team's overall unit's ratings (determined by factors such as Stats, Level, Rarity, and Equipped Skills). The player is then given three teams categorized as either Normal, Hard, and Lunatic. The higher in difficulty the team is, the more points the player earns.
 * Unit Survival - After winning a battle, the player is then given a score within the range of the difficulty of the battle. This score is determined by the remaining units on the player's team at the end of the battle.
 * Highlighted Heroes - Every few weeks, up to ten heroes are highlighted at the entrance to the Arena. Utilizing any of these highlighted units in Arena Duel increases the player's score. So long as one unit appears, the score is increased. If a highlighted unit dies, the overall score is not affected. However, having more than one highlighted Hero does not increase the overall score.
 * Win Streak - Players earn more points the more times they win consecutively. A streak can continue up to seven wins, upon which the chain ends and they restart from zero points. A streak can also end if the player loses a single battle.

Rewards
The Arena awards players with Feathers so long as they participate. They earn feathers through three different factors. The Player's highest overall score during the week earns them a set amount of feather. The highest score tier is 4000, with 2000 feathers given should a player reach this score. The Player's score also determines their rank compared to all other Heroes players. The higher the player's rank is, the more feathers they earn. Players also receive Defense Points if their team defeats another player's team. Earning Defense Points also nets the player a small amount of Feathers.