Magic Issue

This is what I currently have in my battle.c, how can I lower down the calculation for magic damage? Players have been complaining Jack Frost Skill causes 20k damage each. I have tried to search and search but still no available. Please help.



//MATK_RATE scales the damage. 100 = no change. 50 is halved, 200 is doubled, etc
#define MATK_RATE( a ) { ad.damage= ad.damage*(a)/100; }
//Adds dmg%. 100 = +100% (double) damage. 10 = +10% damage
#define MATK_ADDRATE( a ) { ad.damage+= ad.damage*(a)/100; }
//Adds an absolute value to damage. 100 = +100 damage
#define MATK_ADD( a ) { ad.damage+= a; }