Most of the time will be only one roll. The player will cross column (skill level) and row (dice roll) to read the result. However, at higher levels, a skill can get higher than 20, and so the column. In this case, it is necessary to roll 2 or more times and take the better result. For example, with a skill level of 26, it is necessary to roll 2 times, one in the 20th collumn and other in the 6th collumn, then take the better result based on the colored table. If possible, I would like to make a math to roll the macro "ceil (column / 20)" times.