Giant Strike

• Storm Strike. The target takes an extra 1d6 lightning damage. If the target is a creature, it must succeed on a Constitution saving throw, or it has disadvantage on attack rolls until the start of your next turn.

The saving throw DC for these effects equals 8 + your proficiency bonus + your Strength or Constitution modifier.

You can use this feat a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.