Units cannot be controlled. However, you can place them for maximum results. If you position a unit in front, it will engage a monster first. You can permanently expand the units equipment slots up to 100. If your unit storage is full, you cannot enter a battle. You can upgrade your units up to 5 ATK, DEF, and HP. You can use the same or lower level unit as a resource to upgrade a base unit. When using the same level unit material your success will be guaranteed. When using a lower level unit material, your success rate will vary depending on the level difference between the base and material units. You can also fuse two same level units. Each unit's level should be 30 and their upgraded level should be 5. To use a unit must leave a party before being used as fusion material. You can randomly get one higher level unit than the base unit through fusion. Any equipped items on your units will be removed when fusing.