ok, yes, all the plate items are normal defense until 5 star, where it gains elemental or piercing with volcanic or ironmight, respectively.
so why does volcanic plate shield just stay normal defense? its the only plate thing that does.
make VPS elemental!
Since it has fire defense to balance against Ironmight it would have to have at least a couple bars of element less than Ironmight has in pierce, though I agree the shield ought to have some element defense on it. Ironmight set has normal with pierce, Volcanic set excluding the shield has normal with element; Ancient is its own set outside the Plate lines in spite of the name.