The Fieldron is a component used in the crafting of weapons from the Dojo Energy Lab. Blueprints for Fieldrons can be purchased from the Energy Lab interface in the Dojo for 15,000 once it has been researched. These blueprints are not reusable so one must buy multiple blueprints to craft multiple Fieldrons. Fieldron are a potential Invasion reward. Fieldron can also drop from Corpus Storage Containers.