Maplestory Myths - know any?

I call bull on the scrolls failing to pass.

100% agree.
For anyone not clear on the code there, the relevant part is;

Code:

iSuccess = rankdom 32 bit number;
if (iSuccess % 101 > Scroll->SuccessRate)
{
   /* fail and do similar test for destruction if it has a Scroll->CurseRate */
}
{
   /* succeed */
}

Regardless of what the random number that comes back as, it will never be greater than 100, because it's being modded by 101.
The highest value it can achieve is a 100, and since it's > not >=, it'd still succeed.

This logic has been around since the dawn of time, even MUDs typically used;

Code:

int number_percent( void )
{
    return (number_mm() % 100)+1;
}

To do their probability tests since the early days.