Thundling's Fulgurs

You perform a ritual that gives you and up to 5 allied creatures (chosen by you) within range and you can see a magical boost.

You and the other creatures are pervaded by little thunderbolts and take 2d4 Lightning damages: in the same moment you take the damages, invigorating shocks spread through all your muscles and you gain advantage on check and saving throws in Dexterity, rolls to hit and increase your movement speed by 10 ft/round.

When you hit an opponent with Bludgeoning or Lightning damages (while you are under the effect of this spell), the target must make a Constitution saving throws: if he fails, a thunderous sound rumbles in its head, leaving him in Stunned condition for 1 round.

A target recovered from Stunned condition (due only to the effect of this spell) cannot be stunned again using the effect of "Thundling's Fulgurs" for another 5 minutes. However, the target can be stunned again using any other effect that causes that condition.

The spell has effect on you and the other creatures as long as the storm does not disappear (because of natural and/or articial causes) and as long as you can mantain Concentration. If a creature on which this ritual is active enters or is imprisoned in an enclosed AND sheltered space from the storm (e.g.: a canopy is sheltered, but it is not an enclosed space, so the effect of the spell does not end) or within any insulating barrier (e.g.: wooden or rubber prison) he loses all the benefits of the spell.