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The Watersparkers
The Watersparkers
Rare
Electrify Water: When the wearer stands in water during combat, it becomes electrified.
Watersparks: If the wearer starts their turn on an electrified surface, they gain 3 Lightning Charges.
An enormous storm was raging the first time Yrre the Sparkstruck left the Underdark. The deep gnome's interest in lightning became at once an all-consuming obsession, and they would spend the rest of their years striving to recreate that storm's power themselves.
Location - The Watersparkers
Located in the 
Shattered Sanctum. You can find the boots inside a gilded chest near Minthara.
Discussion
Gale can absorb the Magic from this Item. If Gale consumes it, it vanishes forever. That is irreversible and unavoidable.
(There is better food for Gale: Ring of Color Spray, Frayed Drow Hood, Sunwalkers Gift, Everseeing Eye Necklace, Exterminators Axe; Hunting Shortbow, Kormira's Locket, Spiderstep Boots.)