Your Grasp of Dwarven Rune Magic has progressed to the point that you are capable of channelling the power of the Runes forged into your armour at will. Gain the following two abilities.
Thunderous Rebuke
You can thunderously rebuke attackers. When a creature within 5 feet of you that you can see hits you with an attack, you can use your reaction to cause the creature to make a Dexterity saving throw. The creature takes 2d8 lightning or thunder damage (your choice) on a failed saving throw, and half as much damage on a successful one.
You can use this feature a number of times equal to your Wisdom modifier (a minimum of once). You regain all expended uses when you finish a long rest.
Destructive Wrath
You can use your Channel Divinity to wield the power of the storm with unchecked ferocity.
When you roll lightning or thunder damage, you can use your Channel Divinity to deal maximum damage, instead of rolling.