Your Talent Point (TP) allocation should focus on the Magus's hybrid nature.
How far along are you in the progression, and are you primarily focusing on solo farming or party-based dungeon runs? rappelz magus build
Use Master Class sets that prioritize Intelligence and Wisdom. For farming, some players even utilize a Longbow or Crossbow setup to overcome the Magus's lack of "spam" skills. Belt & Soul Stone Setup Your Talent Point (TP) allocation should focus on