Just found this item for my Echoing Strike warlock, will this lose durability or will I need to find a regular one?

Yes but if it's gg roll might be worth putting a zod

itll lose durability from what?

Its in a "shield" slot... what do shields lose durability from?

it’ll lose durability from flipping through the pages while reading

Lol exactly… books irl lose durability all the time

So whats the answer here? I also have an eth one in but I havent used it

if you wear gear in every slot, it will lose durability with a 2% chance every time you get hit. blocking does not reduce durability.
source: https://maxroll.gg/d2/resources/durability-quantity

The book is an offhand shield.. so it will definitely lose durability as you get hit