Randomized units

Randomized units refers to units that are allowed to be selected for random enemy generation. These modes all use the same pool of Heroes to choose from:
 * Training Tower
 * Tempest Trials
 * Rival Domains
 * Randomized units are used for both enemies as well as empty player brigade slots.
 * Forging Bonds
 * Allegiance Battles
 * Hall of Forms
 * Mjölnir's Strike

Criteria
Heroes must fulfill all of these criteria in order to be eligible: Among the Heroes that do satisfy these criteria, the following Heroes are not present in the current random unit pool:
 * The Hero must be in the general summoning pool.
 * The Hero must not be able to learn a refresher skill such as or.
 * The Hero is not a Brave Hero.

Archive
The following Heroes are part of the random unit pool upon launch of the game:

The following table lists all changes to the random unit pool, and their associated summoning events.