This is a build for both PVP and PVE. It kicks ass in both areas. It also looks great, cus you can't be the best without being fabulous.
Right Hand: Lightning Greatsword +10, Lightning Uchigatana +10, Dark Dragonrider's Bow +5 or Lightning Bow of Want +5
Left Hand: Lightning/Dark Dragon Chime +5, Magic Shield +10 (parries and strong magic defense, along with Spell Parry)
Hexer's Hood, Faraam Chest +10, Saint's Leggings +5, Lion Mage Cuffs +10. Black Leather Boots +10 work well too; twinkling titanite sucks to get.
Rings: Cloranthy +2, RoSP +2, Third Dragon, Clear Bluestone +2
I also recommend having Covetous Silver Serpent +2 for 30% extra souls, and change that out with Clear Bluestone because they are right next to eachother if you put most rings in item box.
I personally recommend 4 copies of Great Lightning Spear, because of the quick casting and 28 casts. It's tough to run out of casts. Along with WoG, Great Magic Barrier, SLB, and Great Heal, it's a stacked setup. If you choose to imbue dragon chime with Dark, I suggest Great Resonant Soul and Resonant Soul, along with Darkstorm.
I used lightning for swords because of scaling and Sunlight Blade. I suggest using that regardless of the miracle/hex preference because its damage is based off of the sword, not the catalyst. Hex damage is a percentage of the catalyst dark damage, so if you plan to use hexes, definitely go for the Dark Imbuing.
I actually recently Soul Vesseled this build from a sorcery/hex build. So, that's why I had the DragonRider bow. It still hits 500+. I didn't go for a greatbow due to weight.
Anyways, leave a comment if you have any questions. Thanks guys!