Trial of the Storm Herald #70101

As you tread a cliffside path under thunderclouds, lightning suddenly weaves itself into the outline of a translucent steed. This arc-formed creature neighs and hurls a horseshoe-shaped crystal, prompting a chase. Each time you're about to touch it, its body disintegrates into blue sparks and reassembles farther ahead. At the cliff's edge, it transforms into a vial wrapped in static, filled with liquid that churns like bottled lightning.