Storm Warhorse: Lightning Transformation Charge

A war horse (powerful black stallion, wet mane, armored chest plate, flared nostrils, rearing violently) transforms into a storm beast of wind and lightning, muscles rippling under the skin as glowing runes appear, mane extending into streaming arcs of electricity, hooves breaking into vortexes of air, body partially becoming translucent storm matter before charging forward and creating a tornado trail behind it, on an open battlefield plain (torn flags, rain-soaked mud, abandoned wagons, distant mountains, dark thunderclouds rolling overhead) (epic live-action VFX, dramatic side tracking and heroic low-angle framing, close-ups of hooves dissolving into vortex energy, storm light, lightning flashes, rain spray, dust and a fierce mythic battlefield atmosphere)