fSTR2 table
ΔSTR = your STR - monster VIT
This is what so called STR - VIT damage bonus which will be added to your base damage.
The table below is the table for ranged damage bonus. Melee damage bonus is half the value of ranged damage bonus
[*] is the upper / lower limit cap
[?] is an uncertain value, which was only confirmed in ranged attack's value

  ---+-----------------------------------------------------
   |  0   1   2   3   4   5   6   7   8   9  10  11(rank)
---+-----------------------------------------------------
-42|                    -10?-12
-41|                 -8?    -12
---+-----------------------------------------------------
-40|                        -12
-39|                        -12
-38|                       *-12
-37|                    -10?-11
-36|                        -11
-35|                        -10
-34|                    -10 -10
-33|             -6? -8? -9 -10
-32|                 -8? -9  -9
-31|                 -8  -8? -9
---+-----------------------------------------------------
-30|                 -8  -8  -8
-29|             -6? -7  -8  -8
-28| -2? -3? -4? -6  -7  -7  -8
-27|             -6  -6? -7  -7
-26|             -6  -6  -6? -7
-25|         -4? -5  -6  -6  -6
-24|         -4  -5  -5  -6  -6
-23|     -3  -4  -5  -5  -5  -6
-22|     -3  -4  -4  -4? -5  -5
-21|     -3  -3  -4  -4  -4? -5
---+-----------------------------------------------------
-20|     -3  -3  -4  -4  -4  -4
-19|     -3  -3  -3  -3  -4  -4
-18|    *-3  -2  -3  -3  -3  -4
-17|     -2  -2  -2? -3  -3  -3
-16| -2? -2  -2  -2  -2  -2? -3
-15| -2  -2  -1  -2  -2  -2  -2
-14| -2  -1  -1  -1  -2  -2  -2
-13| -1  -1  -1  -1  -1  -1  -2
-12| -1  -1   0   0? -1  -1  -1
-11| -1   0   0   0   0?  0? -1
---+-----------------------------------------------------
-10|  0   0   0   0   0   0   0
 -9|  0   0   1   1?  0?  0   0
 -8|  0   1   1   1   1   1?
 -7|  1   1   1   1   1   1
 -6|  1   1   2   2   2   1
 -5|  1   2   2   2   2   2
 -4|  2   2   2?  2   2   2
 -3|  2   3   3   3   3   3?
 -2|  2?  3   3   3   3   3
 -1|  3   3   4   3   3   3
---+-----------------------------------------------------
   |  0   1   2   3   4   5   6   7   8   9  10  11(rank)
---+-----------------------------------------------------
  0|  3   4   4   4   4   4
  1|  4   4   4   4   4   4
  2|  4   4   5   5?  5?  5?
  3|  4   5   5   5   5   5
  4|  5   5   5   5   5   5
  5|  5   5   6   6   6   6
  6|  5   6   6   6   6   6
  7|  6   6   6   6?  6?  6?
  8|  6   6   7   7   7   7
  9|  6?  7   7   7   7   7
---+-----------------------------------------------------
 10|  7   7   7   8   8   8
 11|  7   7   8   8   8   8
 12|  8   8   8   8?  8?  8?
 13|  8   8   8?  9?  9?  9
 14|  9   9   9   9   9   9
 15|  9   9              10
 16| 10  10  10  10  10  10
 17| 10  10  10  10  10? 10?
 18| 11  11  11  11  11  11
 19| 11  11  11  11  11  11
---+-----------------------------------------------------
 20| 12  12  12  12  12  12
 21| 12  12  12  12  12  12
 22| 13  13  13  13  13  13
 23| 13  13  13  13  13  13
 24| 14  14  14  14  14  14
 25| 14  14  14  14  14  14
 26| 15  15  15  15  15  15
 27| 15  15  15  15  15  15
 28|*16  16  16  16  16  16
 29| 16  16  16  16  16  16
---+-----------------------------------------------------
 30| 16  17  17  17  17  17  17  17
 31| 16  17  17  17  17  17  17  17
 32| 16 *18  18  18  18  18  18  18
 33| 16  18  18  18  18  18  18  18
 34| 16  18  19  19  19  19  19  19
 35| 16  18  19  19  19  19  19  19
 36| 16  18 *20  20  20  20  20  20
 37| 16  18  20  20  20  20  20  20
 38| 16  18  20  21  21  21  21  21
 39| 16  18  20  21  21  21  21  21
---+-----------------------------------------------------
 40|            *22  22  22  22  22
 41|             22  22  22  22  22
 42|             22  23  23  23  23
 43|             22  23  23  23  23
 44|             22 *24  24  24  24
 45|             22  24  24  24  24
 46|             22  24  25  25  25
 47|             22  24  25  25  25
 48|             22  24 *26  26  26
 49|
---+-----------------------------------------------------
 50|
 51|
 52|
 53|
 54|
 55|
 56|
 57|
 58|
 59|
---+-----------------------------------------------------
(ΔSTR)