When he's done talking, you'll find a chest with a Lightscale Trident inside. This weapon can break, but, unlike other weapons, you can repair and reforge this weapon. Just speak to Dento in the Zora's Domain shop.

What happens if you break the Lightscale Trident?

If the Lightscale Trident breaks, Dento will remake it with one Zora Spear, one Diamond, and five pieces of Flint without charge. The Lightscale Trident is made of metal, and therefore can attract Lightning if it's equipped during storms.

How durable is the Lightscale Trident?

The Lightscale Trident has a very fast use time, with a power of 22 and durability of 70. Link obtains this weapon after saving Zora's Domain from the trouble caused by the Divine Beast Vah Ruta.