Editing MathHammer (section)

==Feel No Pain or Ignoring Unsaved Wounds==
Some units have abilities or can benefit from psychic powers that let them ignore unsaved wounds on a roll of 6+ or 5+. To calculate the effect of this divide 6 by the number of rolls that will go through the Feel No Pain ability, with a 6+ that would be 6/5=1.2 and with a 5+ it is 6/4=1.5. So assuming the damage of the weapon is 1 then a 6+ FNP increases durability by 20% and a 5+ by 50%. 

With multiple damage it becomes a little more complicated. A given unsaved wound with a damage characteristic of x has a 1/6, 1/36, 1/216, 1/1296, 1/7776, 1/46656 of being reduced by 1, 2, 3, 4, 5, 6‬ damage by a 6+ FNP or 1/3, 1/9, 1/27, 1/81, 1/243, 1/729 by a 5+ FNP.

Let's say your Deathshroud Terminators with 2 wounds per model and a 5+ FNP fail 10 saves with D3 damage. The first wound will cause 3 damage 27/81 times, 2 damage 27/81 times and 1 damage 27/81 times. 

:3 damage gets reduced to 0 damage 1/27 times, 1 damage 6/27 times, 2 damage 12/27 times, 3 damage 8/27 times. 
:2 damage gets reduced to 0 damage 3/27 times, 1 damage 18/27 times, 2 damage 6/27 times. 
:1 damage gets reduced to 0 damage 9/27 times, 1 damage 18/27 times. 
:13/81 times the first wound does 0 damage, 42/81 times the first wound does 1 damage, 18/81 times the first wound does 2 damage, 8/81 times the first wound does 3 damage. 
:To make up for the wounds that do no damage we multiply by (81+13)/81
:To make up for the wounds that cause 1 damage we multiply by (81+42)/81
:10*(81+13)/81*(81+42)/81=5.67 Deathshroud Terminators die on average.