Unit Enhancing/Enhancing

Taken from the game's help section.

Enhancing Units
Enhancing is the process of combining multiple units to make one, single unit stronger.

The unit you wish to make stronger is your "base unit." All other units selected will be merged with the base unit to make it stronger. Both units and gimmel are required to enhance a unit. Once units have earned enough EXP, the level of the base unit will increase.


 * You can get gimmel by selling units or completing quests.
 * Units sacrificed to a base unit will be CONSUMED during the process.
 * You can not designate your Leader unit, nor a unit on your Favorites list, as a unit to be sacrificed in Enhancing.