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Ludology Host and Dice Tower Contributor
Tell me, please, where does the energy for shields: from a common pool or from the production of energy?
Are you talking about the yellow shield icons? Those don't require energy. They just automatically reset each combat, assuming the card itself gets energy.
If you're referring to Psychic Barrier, you put as much energy on the card as you want during Construction.
Please let me know if I didn't answer your question!