7 Hex Dragon Fast Dice Roller
Roll 1-12 sets of 1-20 dice with 4, 6, 8, 10, 12, or 100 sides; then add or subtract 0-20 per set
(defaults to 6 sets of 3 dice with 6 sides plus/minus 0 per set):
Four sets of 3 six-sided dice minus 1 |   4x3d6-1 |
Five sets of 3 eight-sided dice |   5x3d8 |
One ten-sided die plus 2 |   d10+2 |