Monster Arena Build

Headgears
Upper Headgear - Magic Eyes [1] - Vesper Card
Middle - Blinker [1] - Vesper Card
Lower Headgear - Arctic Wings
Armors & Weapons:
Weapon - +10 Rod [4] - 4 Margaretha Sorin Card
Armor - White Valkyrie Armor [1] - Tao Gunka or Ghostring Card
Shield - White Valkyrie Shield [1] - Alice Card
Garment - White Valkyrie Manteau - Noxious Card or Deviling Card
Shoes - White ValkyrieShoes [1] - Eddga Card
Accessories - 2x Orleans Glove [1] - Alligator Card
Stats:
Int: 255
Dex: Make sure you hit 150 Dex.
Vit: Rest of the points available.
Be sure to bring usables in Monster Arena, you'll definitely need it since monsters will swarm you.
Use Soul Link Scroll for Wizard, to maximize your HP. Can be obtainable in Mall or VIP Status Healer
This build is efficient to kill Sword Guardian Mobs, you can experiment other builds if you wish to choose different mobs inside the Arena.