To farm Unit Orbs in Loop Hero, you will need a village? spawn building, and turn a Wheatfield into an Overgrownfield.
The overgrown field will spawn swarm enemies that tend to drop Unit Orbs. For this reason, farming swarm enemies that spawn is your best bet for farming Unity Orbs.
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However, the building you need to spawn these enemies is difficult to obtain. A village? is very different from the building in the village that bears the same name, and therefore the method of obtaining it differs.
That said, you'll first need to go down a total of 10 forests for Village A? building to spawn. When the A Village? appears, build a wheat field next to it and the field will become an overgrown field.
The overgrown field will then spawn one of the enemy types you need to farm Unity Orbs, which is called a Blade Field. Shut down those Blade Fields of enemies at your leisure and you'll get the Unit Orbs you need.
You can also farm Blood Clots and Bat Swarm for Orbs, but the fastest is using Field of Blades.
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