"Potential Energy" (Plutarch's Tale) is a Wulfgard short story by Justin R. R. Stebbins, which tells the story of Septimus Plutarch first discovering his magical gift. It is included in the Tales of Wulfgard: Volume I short story collection.
Septimus Plutarch is a man of great ambition. A younger son chafing against his father's wishes, he tries to forge his own plan for his future. Then one day, he discovers he has a special gift that changes everything.