Spell.dbc/AttributesEx

enum SpellAttr1

   SPELL_ATTR1_DISMISS_PET                      = 0x00000001, //  0 for spells without this flag client doesn't allow to summon pet if caster has a pet
   SPELL_ATTR1_DRAIN_ALL_POWER                  = 0x00000002, //  1 use all power (Only paladin Lay of Hands and Bunyanize)
   SPELL_ATTR1_CHANNELED_1                      = 0x00000004, //  2 clientside checked? cancelable?
   SPELL_ATTR1_CANT_BE_REDIRECTED               = 0x00000008, //  3
   SPELL_ATTR1_UNK4                             = 0x00000010, //  4 stealth and whirlwind
   SPELL_ATTR1_NOT_BREAK_STEALTH                = 0x00000020, //  5 Not break stealth
   SPELL_ATTR1_CHANNELED_2                      = 0x00000040, //  6
   SPELL_ATTR1_CANT_BE_REFLECTED                = 0x00000080, //  7
   SPELL_ATTR1_CANT_TARGET_IN_COMBAT            = 0x00000100, //  8 can target only out of combat units
   SPELL_ATTR1_MELEE_COMBAT_START               = 0x00000200, //  9 player starts melee combat after this spell is cast
   SPELL_ATTR1_NO_THREAT                        = 0x00000400, // 10 no generates threat on cast 100% (old NO_INITIAL_AGGRO)
   SPELL_ATTR1_UNK11                            = 0x00000800, // 11 aura
   SPELL_ATTR1_IS_PICKPOCKET                    = 0x00001000, // 12 Pickpocket
   SPELL_ATTR1_FARSIGHT                         = 0x00002000, // 13 Client removes farsight on aura loss
   SPELL_ATTR1_CHANNEL_TRACK_TARGET             = 0x00004000, // 14 Client automatically forces player to face target when channeling
   SPELL_ATTR1_DISPEL_AURAS_ON_IMMUNITY         = 0x00008000, // 15 remove auras on immunity
   SPELL_ATTR1_UNAFFECTED_BY_SCHOOL_IMMUNE      = 0x00010000, // 16 on immunity
   SPELL_ATTR1_UNAUTOCASTABLE_BY_PET            = 0x00020000, // 17
   SPELL_ATTR1_UNK18                            = 0x00040000, // 18 stun, polymorph, daze, hex
   SPELL_ATTR1_CANT_TARGET_SELF                 = 0x00080000, // 19
   SPELL_ATTR1_REQ_COMBO_POINTS1                = 0x00100000, // 20 Req combo points on target
   SPELL_ATTR1_UNK21                            = 0x00200000, // 21
   SPELL_ATTR1_REQ_COMBO_POINTS2                = 0x00400000, // 22 Req combo points on target
   SPELL_ATTR1_UNK23                            = 0x00800000, // 23
   SPELL_ATTR1_IS_FISHING                       = 0x01000000, // 24 only fishing spells
   SPELL_ATTR1_UNK25                            = 0x02000000, // 25
   SPELL_ATTR1_UNK26                            = 0x04000000, // 26 works correctly with [target=focus] and [target=mouseover] macros?
   SPELL_ATTR1_UNK27                            = 0x08000000, // 27 melee spell?
   SPELL_ATTR1_DONT_DISPLAY_IN_AURA_BAR         = 0x10000000, // 28 client doesn't display these spells in aura bar
   SPELL_ATTR1_CHANNEL_DISPLAY_SPELL_NAME       = 0x20000000, // 29 spell name is displayed in cast bar instead of 'channeling' text
   SPELL_ATTR1_ENABLE_AT_DODGE                  = 0x40000000, // 30 Overpower
   SPELL_ATTR1_UNK31                            = 0x80000000  // 31

Extracted from Trinity Core Source (SharedDefined.h) .Ascathos 13:55, 5 October 2012 (UTC)