Ragnarok
Each hit deals an additional 1d12 lightning damage. On a critical hit, you may immediately take one additional Action (once per turn).
Complete rules
Storm-Bound Edge Each hit deals an additional 1d12 lightning damage. Critical Surge On a critical hit, you may immediately take one additional Action (once per turn). Storm of Ending (1/long rest) As an action, slam the greataxe into the ground. Creatures in a 60-foot cone must make a DC 18 Dexterity saving throw. • On a failure: take 10d10 lightning + 10d10 thunder damage, are knocked prone, and stunned until the end of your next turn. • On a success: take half damage and are not stunned. Structures in the area may crack or collapse (DM adjudicated). Allies in the cone may choose to automatically succeed if they can see or hear you.