A hit

die is in simplest terms a 'title' given to any die used in calculating

damage in

pen and paper, and some

digital RPGs that draw their

roots from pen and paper. Its a little more

complex in that its often used to mean "the hit die are" where you have a

written structure of rolls of die, written as:

*rolls* **d** *sides*
so:
the hit die * is* as example **d**20
the hit die *are* as example 4**d**20

The

nature of this

structure is allowing to have a range of

randomness other than 1 to x, instead y to x, and also to effect the

probability of achieving either the lowest or highest value due to your

combination sets.

In the above example since your

rolling four 20

sided die you can't achieve less than 4, and can achieve as much as 80, and the odds of achieving 4 or 80 are 20^4th ( 1 in 160

k ) instead of with one 80 sided die 1 in 80, whereas mid

range numbers grow much more

probable with multiple die.

4d2 probability chart:

__
d1| d2| d3| d4| Result__
1 | 1 | 1 | 1 | 4 1/16 = 4 6.25%
1 | 1 | 1 | 2 | 5 4/16 = 5 25.00%
1 | 1 | 2 | 1 | 5 6/16 = 6 37.50%
1 | 1 | 2 | 2 | 6 4/16 = 7 25.00%
1 | 2 | 1 | 1 | 5 1/16 = 8 6.25%
1 | 2 | 1 | 2 | 6
1 | 2 | 2 | 1 | 6
1 | 2 | 2 | 2 | 7
2 | 1 | 1 | 1 | 5
2 | 1 | 1 | 2 | 6
2 | 1 | 2 | 1 | 6
2 | 1 | 2 | 2 | 7
2 | 2 | 1 | 1 | 6
2 | 2 | 1 | 2 | 7
2 | 2 | 2 | 1 | 7
2 | 2 | 2 | 2 | 8