Stat Gen Syntax Question

   Is it possible to create a macro that generates a number from 13-18 but allows for the odds of an 18 to be very low as if one rolled a 3d6?  I don't mean /roll 1d6+12, I mean /roll 3d6 but the result not being less than a 13.
Yes. Here is the information you need.
As an example, this rolls 3d6, keeps the lowest, and adds to 12. /roll 12+3d6kl1  If you want to roll 3d6, but set all rolls below 13 to 13 (which will be around 75% of results, so i dont recommend it) /roll {3d6,0d0+13}kh1
Thank you sir. that was what I was looking for.