This build uses heavy armour with the miracle buffs of Sacred Oath and Great Magic Barrier to create a very tanky player for PvP. It also uses Sunlight Blade with a lightning infused Heide Spear to increase lightning damage. Oh and you can roll.
Lightning Infused Heide Spear +10
Defender's Shield +5
Any Sacred Chime (Only used for buffing so damage is irrelevant)
Smelter Demon Helm +5
Havel's Armour +5
Havel's Gauntlets +5
Havel's Leggings +5
Royal Soldier's Ring +2
Third Dragon Ring
Southern Ritual Band +2
Ring of Blades +2
Great Magic Barrier
With a +10 Lightning Infused Heide Spear you get a lightning damage of 238 plus a physical damage of 207 in this build. Sunlight Blade will then increase the lightning damge by 30% as well as add an additional 50 lightning damage. This gives a lightning damage of roughly 359 plus the 207 physical damage. Sacred oath also adds an additional 50 points of physical damage. So you can see for a spear it hits pretty hard. For a shield I chose a medium shield in this case the Defender's Shield for the low weight but high stability for a medium shield when reinforced. What chime you use is not important as it wont be used for attacking as you only have just enough attunement slots for the miracles listed. If you wanted you could substitute Great Magic Barrier for a Great Lightning Spear or something for ranged damage instead of a purely melee orientated build. You can also use a secondary right hand weapon as your carry weight is only 62.8% to change it up after your Sunlight Blade has worn off.
This build is good when you have slow internet as you can take a lot of hits and backstabs. Slash weapons are particularly useless against it. A main benefit of this build is that you can roll while still wearing the strongest and quite heavy armour meaning you can dodge attacks as well rather than just blocking or taking the hit.