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/usr/share/crawl/docs/aptitudes.txt is in crawl-common 2:0.10.3-3.

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The actual contents of the file can be viewed below.

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TABLES OF APTITUDES

The following three tables describe all aptitudes of the various species
for the various skills. These are not necessary for winning in Crawl,
neither explicit nor implicit. The qualitative information behind this
sheet (i.e., which species is good at which tasks) can be obtained in
two other, less sophisticated ways:
- Read the species section in the manual about strengths and weaknesses.
- Look at which combinations of species and background are recommended
  (lightgrey).

If you consider figuring out such things yourself to be fun, stop
reading now. Otherwise, just go ahead.

 -5  abysmal aptitude
 -4  terrible aptitude (learning half as fast as Humans)
 -3  very poor aptitude
 -2  poor aptitude
 -1  slightly disfavoured aptitude
  0  standard aptitude (Humans)
 +1  slightly favoured aptitude
 +2  strong aptitude
 +3  very strong aptitude
 +4  outstanding aptitude (learning twice as fast as Humans)
 +5  exceptional aptitude

Please note that many things affect how quickly a character will
actually learn a skill. Thus, the numbers below are good enough for
comparisons among species, but not necessarily among skills.

There are three special values: HP, MP and Experience:
- The HP and MP values indicate the percentages of hit points and magic
  points that are gained per level. 0 is the Human standard, -1 is 10%
  fewer points, +1 is 10% more points, etc.
- The Experience value indicates how much experience has to be earned in
  order to gain a new level. 100 is the Human standard, and all other
  species (apart from Halfling, Kobold and Hill Orc) are slower. For
  example, 150 means 50% more experience must be earned.

The abbreviations used for the skills are:

General skills, Experience   Melee and Ranged Combat     Spellcasting and Magic
--------------------------   -----------------------     ----------------------
Arm - Armour                 Fgt - Fighting              Spc - Spellcasting
Ddg - Dodging                SBl - Short Blades          Coj - Conjurations
Sth - Stealth                LBl - Long Blades           Hex - Hexes
Stb - Stabbing               M&F - Maces & Flails        Cha - Charms
Shd - Shields                Axs - Axes                  Sum - Summonings
T&D - Traps & Doors          Pla - Polearms              Nec - Necromancy
                             Stv - Staves                Trl - Translocations
Inv - Invocations            UC  - Unarmed Combat        Trm - Transmutations
Evo - Evocations
                             Thr - Throwing              Fir - Fire Magic
HP  - hit points             Slg - Slings                Ice - Ice Magic
MP  - magic points           Bws - Bows                  Air - Air Magic
Exp - experience             Crb - Crossbows             Ear - Earth Magic
                                                         Poi - Poison Magic


                 Arm Ddg Sth Stb Shd T&D   Inv Evo        HP  MP   Exp
----------------------------------------------------------------------
Human              0   0   0   0   0   0     0   0         0   0   100
Centaur           -3  -3  -4  -3  -3  -2     0  -1        +1  -1   140
Demigod           -1  -1  -1  -1  -1  -1    NA  -1        +1  +2   160
Demonspawn        -1  -1  -1  -1  -1  -1    +2   0         0   0   150
Draconian         NA  -1  -1   0   0   0     0   0        +1   0   140
         Black    NA  -1  -1   0   0   0     0   0        +1   0   140
         Green    NA  -1  -1   0   0   0     0   0        +1   0   140
          Grey    NA  -1  +2  +2   0   0     0   0        +1   0   140
       Mottled    NA  -1  -1   0   0   0     0   0        +1   0   140
          Pale    NA  -1  -1   0   0   0     0  +1        +1   0   140
        Purple    NA  -1  -1   0   0   0     0  +1        +1   0   140
           Red    NA  -1  -1   0   0   0     0   0        +1   0   140
         White    NA  -1  -1   0   0   0     0   0        +1   0   140
        Yellow    NA  -1  -1   0   0   0     0   0        +1   0   140
Deep Dwarf        +1  +1  +2  -1  +1  +1    +2  +3        +2   0   130
Mountain Dwarf    +3  -1  -3  -2  +2  +1     0  +1        +1  -1   130
Deep Elf          -2  +2  +2  +1  -2   0     0  +1        -2  +3   140
High Elf          -1  +1  +1  -1  -1   0     0   0        -1  +2   150
Sludge Elf        -2  +2  +1   0  -2   0     0   0        -1  +1   120
Felid             NA  +3  +3  +3  NA  +2    -1  -2        -4  +2   140
Ghoul             -1  -1  +1   0  -1  -1     0  -1        +1  -1   120
Halfling          -2  +2  +3   0  +1   0     0  +1        -1   0   100
Kobold            -2  +2  +3  +2  -2   0     0  +2        -2   0   100
Merfolk           -3  +3  +1  +2   0  -1     0   0         0   0   120
Minotaur          +2  +1  -2  -1  +2   0    -1  -1        +1  -2   130
Mummy             -2  -2  -2  -2  -2  -2    -2  -2         0   0   140
Naga              -2  -2  +5   0  -2   0     0   0        +2   0   120
Octopode          NA   0  +3   0   0  +1     0  +1        -1   0   120
Ogre              -2  -1  -2  -2  -1  -2     0  -2        +3   0   110
Hill Orc          +1  -2  -2  +2  +1   0    +2   0        +1   0   100
Spriggan          -3  +4  +4  +4  -3  +3    -1  +3        -3  +3   130
Tengu             +1  +1   0  +1   0   0    -2   0        -2  +1   130
Troll             -2  -2  -5  -2  -2  -4    -2  -3        +3  -2   150
Vampire           -2  +1  +4  +1  -1   0    -2  -1         0   0   150
----------------------------------------------------------------------
                 Arm Ddg Sth Stb Shd T&D   Inv Evo        HP  MP   Exp


                 Fgt SBl LBl M&F Axs Pla Stv UC    Thr Slg Bws Crb
----------------------------------------------------------------------
Human              0   0   0   0   0   0   0   0     0   0   0   0
Centaur            0  -1  -1  -1  -1  -1  -1   0    +3  +1  +3  +1
Demigod           -1  -1  -1  -1  -1  -1  -1  -1    -1  -1  -1  -1
Demonspawn         0  -1  -1  -1  -1  -1  -1  -1    -1  -1  -1  -1
Draconian         +1   0   0   0   0   0   0   0    -1  -1  -1  -1
         Black    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
         Green    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
          Grey    +1   0   0   0   0   0   0   0     0  -1  -1  -1
       Mottled    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
          Pale    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
        Purple    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
           Red    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
         White    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
        Yellow    +1   0   0   0   0   0   0   0    -1  -1  -1  -1
Deep Dwarf        -1  -1   0   0  +1  -1  -1  -1    -1  +1  -3  +1
Mountain Dwarf    +2  +1   0  +2  +2  -1  -1   0    -1  -1  -2  +1
Deep Elf          -2   0  -1  -3  -2  -3   0  -2    +1  -2  +1  -1
High Elf           0  +2  +2  -2  -2  -2   0  -2    +1  -2  +3   0
Sludge Elf        +1  -1  -1  -2  -2  -2   0  +1    +2   0   0   0
Felid             -1  NA  NA  NA  NA  NA  NA  -1    NA  NA  NA  NA
Ghoul             +1  -1  -1  -1  -1  -1  -1  +1    -1  -1  -1  -1
Halfling          -1  +3   0  -2  -1  -3  -2  -2    +3  +4  +2  -1
Kobold            +1  +3  -2   0  -1  -2  -1   0    +3  +2  -1  +2
Merfolk           +1  +2  +1  -2  -2  +4  -2  +1     0  -2  -2  -2
Minotaur          +2  +1  +2  +2  +2  +2  +2  +1     0  +1  +1  +1
Mummy              0  -2  -2  -2  -2  -2  -2  -2    -2  -2  -2  -2
Naga               0   0   0   0   0   0  -1   0    -1  -1  -1  -1
Octopode           0   0   0   0   0   0   0   0     0   0   0   0
Ogre              +3  -4  -3  +3  -3   0  -1  -1    +1  -3  -3  -3
Hill Orc          +2   0  +1  +1  +2  +1  -1  +1     0  -1  -1  -1
Spriggan          -2  +1  -2  -3  -2  -3  -3  -2    +1  +2  +2   0
Tengu              0  +1  +1  +1  +1  +1  +1  +1    +1   0  +1  +1
Troll             -2  -2  -2  -1  -2  -2  -2   0    -1  -4  -4  -4
Vampire           -1  +1   0  -2  -1  -1  -2  +1    -2  -2  -2  -2
----------------------------------------------------------------------
                 Fgt SBl LBl M&F Axs Pla Stv UC    Thr Slg Bws Crb


                 Spc Coj Hex Cha Sum Nec Trl Trm   Fir Ice Air Ear Poi
----------------------------------------------------------------------
Human              0   0   0   0   0   0   0   0     0   0   0   0   0
Centaur           -2  -1  -1  -1  -1  -1  -1  -1    -1  -1  -1  -1  -2
Demigod           -1  -1  -1  -1  -1  -1  -1  -1    -1  -1  -1  -1  -1
Demonspawn         0   0   0  -1   0  +1  -1  -1    -1  -1  -1  -1   0
Draconian          0   0  -1  -1   0   0   0   0     0   0   0   0   0
         Black     0   0  -1  -1   0   0   0   0     0   0  +2  -2   0
         Green     0   0  -1  -1   0   0   0   0     0   0   0   0  +2
          Grey     0   0  -1  -1   0   0   0   0     0   0   0   0   0
       Mottled     0   0  -1  -1   0   0   0   0    +1   0   0   0   0
          Pale     0   0  -1  -1   0   0   0   0    +1   0  +1   0   0
        Purple    +2   0  +1  +1   0   0   0   0     0   0   0   0   0
           Red     0   0  -1  -1   0   0   0   0    +2  -2   0   0   0
         White     0   0  -1  -1   0   0   0   0    -2  +2   0   0   0
        Yellow     0   0  -1  -1   0   0   0   0     0   0   0   0   0
Deep Dwarf        -1  -1  -2  -1  -1  +1  +1  -1    -1  -1  -3  +3  -2
Mountain Dwarf    -3  -1  -2  -2  -2  -3  -2  -1    +2  -2  -2  +2  -2
Deep Elf          +4  +1  +3  +4  +1  +2  +1  +1    +1  +1  +1   0  +1
High Elf          +2  +1   0  +2  -1  -2  +1  +1     0   0  +2  -2  -2
Sludge Elf        +2  -2   0  -2  +1  +1   0  +3    +1  +1  +1  +1  +1
Felid              0  -1  +4  +2  +1   0  +4  +1    -1  -2  -1  -2  -1
Ghoul             -1  -2  -2  -1  -1   0  -1  -1    -2  +1  -2  +1   0
Halfling          -2  -2  -1  +1  -1  -2  +1  -4     0   0  +1   0  -1
Kobold             0  -1   0  -2   0   0   0  -1     0   0   0   0   0
Merfolk            0  -2   0  +1   0  -2  -2  +3    -3  +1  -2  -2  +1
Minotaur          -3  -3  -4  -4  -3  -3  -3  -2    -3  -3  -3  -2  -3
Mummy              0  -2  -1  -2  -2   0  -2  -2    -2  -2  -2  -2  -2
Naga               0   0   0   0   0   0   0   0     0   0   0   0  +3
Octopode           0   0   0   0   0   0   0   0     0   0   0   0  +2
Ogre              +2  -3  -3  -3  -3  -3  -3  -3    -3  -3  -3  -3  -3
Hill Orc          -2   0   0  -1   0   0  -2  -3    +1  -1  -2   0  -1
Spriggan          +3  -3  +2  +4  -2  -1  +4  +3    -2  -2  -1  -1   0
Tengu              0  +3  -3  -2  +2  +1  -2  -2    +1  -1  +3  -3   0
Troll             -4  -3  -4  -4  -3  -2  -3  -3    -3  -3  -4  -1  -3
Vampire            0  -3  +4  +1   0  +1  -2  +1    -2   0   0   0  -1
----------------------------------------------------------------------
                 Spc Coj Hex Cha Sum Nec Trl Trm   Fir Ice Air Ear Poi