That's just wrong.

.... you didn't know? when i upgraded mine, it didn't give me any extra defense, the main reason you upgrade is for the extra smite damage so don't complain

You are wrong sir, Zakarum Shield Def ranged from 169-193. When you upgrade a item, you have chance of getting the lowest or the highest, unluckily I got def of 174, 17x*2+172 = 522.

My shield before upgrade is 167 Def.