//Put this OnDeath
void main()
{

object oPC = GetLastKiller();

if (!GetIsPC(oPC)) return;

if (d100()<=10)
   {
   CreateItemOnObject("runeore", OBJECT_SELF);

   if (d100()<=50)
      {
      CreateItemOnObject("runegem", OBJECT_SELF);

}
}
}