Summon (召喚, Shōkan) is a feature of Fire Emblem Heroes.
Summoning allows players to summon new Heroes to their army using Orbs to initiate the feature. The player expends 5 Orbs to receive a board containing 5 Orbs. Each orb will have a random color assigned to it upon starting the board, with the color determining what equipment type the summoned Hero will have. After the player selects an orb, a Hero is summoned, with the rarity of the hero being fixed to a percentile chance, hence the player is not guaranteed a 5 Star Hero every board time.
The player is then given the option to summon another Hero on the same board for a reduced cost of 4 Orbs. The player may summon up to three Heroes on the same board for 4 Orbs, where the fifth and final orb on the board will cost 3, making a complete board purchase cost 20 Orbs. Once summoned, that Hero becomes a permanent member of the player's army and can be trained to become stronger, fused with an ally for bonus stats and SP points, sacrificed to pass their skills to another units, or dismissed for an amount of Feathers. Players are given a free summon the very first time they summon from a Banner. Subsequent summons from the same Orb Board will be treated as if the first summon expended 5 Orbs.
Heroes summoned will be 3 Star to 5 Star. Before a Hero is revealed, the pedestal where they are summoned from gives a small hint to the Heroes rarity before they are revealed. If a small quake occurs before the summoning animation, the summoned Hero will be a 4 or 5 Star Hero. If no quake occurs, the summoned Hero will be a 3 Star Hero.
Every normal unit in the game are designated under a summoning rarity. Several characters fall under two rarity category. Common units like Lon'qu and Shanna appear at 3 and 4 Star rarity, Uncommon units like Marth and Camilla appear at 4 and 5 Star rarity, and premium units like Celica and Hector appear exclusively at 5 Star rarity only. These factor the likelihood of summoning a specific character.
Before summoning, players select a Banner which highlights 3 to 4 units in game. These highlighted units are given their own special category in the summoning rate and will always appear at 5 Star rarity if summoned via this method. Banners are non-permanent and constantly cycle with multiple banners appearing at the same time. There are three types of banners:
- New Hero Banners - The most regular banner that appears every three weeks. These banners introduce new Heroes to the game and are the first opportunity for players to summon them. After three weeks, the new Heroes are added to the summoning pool and one of the units will be able to be summoned at 4 or 5 star units while the other two remain 5 Star only units.
- Seasonal Hero Banners - Special variations of Fire Emblem characters appear as special new characters. Like New Hero Banners, these are the first opportunities to summon these Heroes. However, Seasonal Heroes are not added to the summoning pool after their event concludes, giving them a limited time to be acquired. The lone exception are the Brave Hero variants.
- Event Banners - These banners correlate to in-game events such as Tempest Trials and Voting Gauntlet. They are designed to give units that can be used in those upcoming events
- Skill Banners - Several Banners focuses on distributing characters who share the same Passive Skill.
The default percentile chances are as follows:
- 3 Star Unit — 36%
- 4 Star Unit — 58%
- 5 Star Unit — 3%
- Focus Unit — 3%
Prior to August 7th, 2017, the default Appearance Rates for 4 Star and 3 Star Units were swapped.
As the player summons units from a Banner, the percentile chance of summoning a 5 Star Unit or a Focus Unit increases. Every 5 summons without the player pulling either a 5 Star or Focus unit, the appearance rate of both increase by 0.25% while the appearance rates of 3 and 4 Star units both decrease by 0.25%. Once a 5 Star or Focus unit has been summoned, the appearance rate returns to the default percentile chance.
Summoning appearance rates do not affect Banners other than the one the player is summoning from. Hence any changes to Banner A's percentile chances will not change Banner B's appearance rates.