while (angle < 360)
{
    iii = instance_create(x, y, bullettype);
    if (instance_exists(iii))
    {
        iii.angleadd = angleadd;
        iii.angle = angle;
        iii.dmg = global.monsteratk[myself];
    }
    x += lengthdir_x(radius, angle);
    y += lengthdir_y(radius, angle);
    angle += angleadd;
}
instance_destroy();