Units can be freely converted into combatants or workers according to your strategic needs. As long as you have enough equipment!

Give your units the role of workers by crafting equipment that can gather resources.

Stop the monsters from attacking with the combatants and go out to recover the stolen items through the cracks.

As you gather resources, you can build equipment or buildings for combatants that require more resources.

Choose an appropriate upgrade by establishing an appropriate response strategy according to the enemy's attack type.