I tried so hard to give it leo ring but you have to sacrifice so many points into endurance its not even funny... like its only possible if you unequip the catalyst or dark hand at 99 endurance.
Great magic weapon buff is for how his sword shines while he swings it.
You can also use Black Knight Greatsword for the weapon but the moveset on that doesn't fit that well although the looks of the sword is closer to that of penetrator's sword, only beefeer.
I thought about using stone chestplate but the color on that is way too bright. (PC players can edit it.)