From l2wiki
There are Soulshots and Spiritshots, and there are also shots for pets/servitors. For Phys. skills and attack you need Soulshots. For M. skills you need Spiritshots or Blessed Spiritshots. Similarly, for Phys. skills and attacks of servitors/pets Soulshots are required; for M. skills of servitors/pets Beast Spiritshots/Blessed Beast Spiritshots are required. Shots are divided by Grades; the grade of your weapon and the grade of shots must match.