Rune of Thor

Rune of Thor

Rare enhancement

Whenever you deal lightning damage in a thunderstorm, you may deal additional thunder damage for every 10 damage you deal, based off this item's level. If you deal 100 damage or more at once while using this ability, you may make all creatures within 10 feet of your target pass a DC 20 Constitution saving throw or suffer 10d10 thunder damage and become deafened until they rest.

Level 1: 2d6 additional thunder damage per 10 damage dealt
Level 2: 2d10 additional thunder damage per 10 damage dealt
Level 3: 4d8 additional thunder damage per 10 damage dealt
Level 4: 4d12 additional thunder damage per 10 damage dealt
Level 5: 12d6 additional thunder damage per 10 damage dealt