Malphaestus
Touched by the Apocalypse
I haven't mentioned the fact that a full-plate get-up has cloth padding underneath (vastly simplified), for the express purpose of minimizing blunt force trauma. This is why you would need a warhammer. Or something long, like a halberd or pole-weapon. Whilst a staff technically falls under that latter category, it does not have anything with which to deliver any sizable kinetic impact in the same manner a halberd or pole-hammer could.