Spell.dbc/powerType

Version - 3.3.5a - powerType ()

  -2 = HP    
   0 = Mana
   1 = Rage
   2 = Focus
   3 = Energy
   4 = Pet Happiness
   5 = Runes  //Rune Types are as follows - 0 = Blood Rune, 1 = Unholy Rune, 2 = Frost Rune, and 3 = Death Rune.
   6 = Runic
   7 = Max Powers
 127 = All Powers

Notes - These are used in at the least Aura Effects number 30, 85, and 110. Visit the page for more information.

Version - 10.1.0+ (Master Branch 5/13/23) - Powers ()

enum Powers : int8

   POWER_HEALTH                        = -2, // TITLE Health
   POWER_MANA                          = 0,  // TITLE Mana
   POWER_RAGE                          = 1,  // TITLE Rage
   POWER_FOCUS                         = 2,  // TITLE Focus
   POWER_ENERGY                        = 3,  // TITLE Energy
   POWER_COMBO_POINTS                  = 4,  // TITLE Combo Points
   POWER_RUNES                         = 5,  // TITLE Runes
   POWER_RUNIC_POWER                   = 6,  // TITLE Runic Power
   POWER_SOUL_SHARDS                   = 7,  // TITLE Soul Shards
   POWER_LUNAR_POWER                   = 8,  // TITLE Lunar Power
   POWER_HOLY_POWER                    = 9,  // TITLE Holy Power
   POWER_ALTERNATE_POWER               = 10, // TITLE Alternate
   POWER_MAELSTROM                     = 11, // TITLE Maelstrom
   POWER_CHI                           = 12, // TITLE Chi
   POWER_INSANITY                      = 13, // TITLE Insanity
   POWER_BURNING_EMBERS                = 14, // TITLE Burning Embers (Obsolete)
   POWER_DEMONIC_FURY                  = 15, // TITLE Demonic Fury (Obsolete)
   POWER_ARCANE_CHARGES                = 16, // TITLE Arcane Charges
   POWER_FURY                          = 17, // TITLE Fury
   POWER_PAIN                          = 18, // TITLE Pain
   POWER_ESSENCE                       = 19, // TITLE Essence
   POWER_RUNE_BLOOD                    = 20, // TITLE Blood Runes
   POWER_RUNE_FROST                    = 21, // TITLE Frost Runes
   POWER_RUNE_UNHOLY                   = 22, // TITLE Unholy Runes
   POWER_ALTERNATE_QUEST               = 23, // TITLE Alternate (Quest)
   POWER_ALTERNATE_ENCOUNTER           = 24, // TITLE Alternate (Encounter)
   POWER_ALTERNATE_MOUNT               = 25, // TITLE Alternate (Mount)
   MAX_POWERS                          = 26, // SKIP
   POWER_ALL                           = 127 // SKIP

If you are running TrinityCore or one its many forks then this information is most likely located in the source file of "..src\server\game\Spell\SpellMgr.h".