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This study investigates the development of novel high-entropy alloys (HEAs) with enhanced mechanical properties through an innovative fabrication method of direct energy deposition (DED). The focus is on the creation of metastable core-shell precipitation-strengthened HEAs that exhibit a unique multi-stage terrace-like slip wave toughening mechanism, a novel approach to improving both strength and ductility simultaneously. Mechanical testing reveals that the developed HEAs exhibit superior mechanical properties, including high yield strength, ultimate tensile strength, and exceptional ductility. The improvement in these properties is attributed to the multi-stage terrace-like slip wave toughening mechanism activated by the unique microstructural features. This toughening mechanism involves the sequential activation of slip systems, facilitated by the stress concentration around the core-shell precipitates and the …