Various Spells and a magic infused weapon with crystal magic weapon and high INT make this build have very high damage output, physically as well as spell damage.
R1 - Drakekeepers Greataxe (Magic) +10
L1 - Staff of Wisdom (Magic) +10
L2 - Throne Watcher Shield
Desert Sorceress Hood (For extra INT boost)
Alonne Captain Armor +10
Faraam Boots +10
Third Dragon Ring (otherwise you will be fatrolling)
Royal Soldiers Ring +2
Clear Bluestone Ring or +1
Ring of Blades +1 or +2
Crystal Magic Weapon
Homing Crystal Soulmass
Buffing as usual, CMW and HCS, after that you can alternate between CS or SG.
You can also get another HCS in to trick you opponent into a parry or suprise SG, because he will most likely roll towards you if he sees you casting.