Example
1283,Katar_Of_Speed,Katar Of Speed,4,20,,0,175,,1,0,0x00001000,7,2,34,4,0,0,16,{ bonus2 bSkillAtk,"AS_SONICBLOW",25; bonus bAspdRate,3; },{},{}
Search sonic blow in the link of Emistry, look at the associated line then search spear soomerang and look at the line.
Then complete n in bonus2 bSkillAtk,n,x;
It's very easy !