bonus bMatk,100;
if (BaseLevel>=20) {
   bonus bBaseAtk,15;
   bonus bMatk,15;
   if (BaseLevel>=30) {
      bonus bBaseAtk,20;
      bonus bMatk,20;
      if (BaseLevel>=45) {
         bonus bBaseAtk,25;
         bonus bMatk,25;
      }
   }
}