Well, I didn't know that page was there until I specifically searched for it. The wiki is not a particularly well organized place, so I wouldn't know how to navigate to that page if I hadn't already found it with Google.
That said, all the information is available in the code itself. It really isn't that hard to open up Visual Studio and search.
Here's the table from the code:
Code:
SPECATK_SUMMON, // S
SPECATK_ENRAGE, // E
SPECATK_RAMPAGE, // R
SPECATK_AREA_RAMPAGE, // r
SPECATK_FLURRY, // F
SPECATK_TRIPLE, // T
SPECATK_QUAD, // Q
SPECATK_INNATE_DW, // L
SPECATK_BANE, // b
SPECATK_MAGICAL, // m
SPECATK_RANGED_ATK, // Y
UNSLOWABLE, // U
UNMEZABLE, // M
UNCHARMABLE, // C
UNSTUNABLE, // N
UNSNAREABLE, // I
UNFEARABLE, // D
UNDISPELLABLE, // K
IMMUNE_MELEE, // A
IMMUNE_MAGIC, // B
IMMUNE_FLEEING, // f
IMMUNE_MELEE_EXCEPT_BANE, // O
IMMUNE_MELEE_NONMAGICAL, // W
IMMUNE_AGGRO, // H - Won't aggro, ever.
IMMUNE_AGGRO_ON, // G - Immune to being aggroed
IMMUNE_CASTING_FROM_RANGE, // g
IMMUNE_FEIGN_DEATH, // d
IMMUNE_TAUNT, // i
NPC_TUNNELVISION, // t
NPC_NO_BUFFHEAL_FRIENDS, // n
IMMUNE_PACIFY, // p
LEASH, // J - Dispell, wipe agro && return to spawn
TETHER, // j - Return to spawn
DESTRUCTIBLE_OBJECT, // o - This is only for destructible objects
NO_HARM_FROM_CLIENT, // Z - This is to prevent attacking NPC's period for clients