Special ability attack codes

[Rhodan]

I'm trying to figure out what all the possible special ability codes are. Not much in the wiki and the only post listing them is missing several.

The list

A = ?
B = ? (Backstab?)
C = Uncharmable
D = Double Attack
E = Enrage
F = Flurry
I = ?
M = Unmezzable
N = Unstunnable
O = ?
Q = Quadruple attack
R = Rampage
S = Summon
T = Triple Attack
U = Unslowable

Anyone have updates/corrections for this list?

P.S. I found a couple mobs that have numbers in the npcspecialattks column - are those errors or do they mean something as well? One has a 0 the other is 50.

[KLS]

enum {
SPECATK_NONE = 0,
SPECATK_SUMMON, //S
SPECATK_ENRAGE, //E
SPECATK_RAMPAGE, //R
SPECATK_FLURRY, //F
SPECATK_TRIPLE, //T
SPECATK_QUAD, //Q
UNSLOWABLE, //U
UNMEZABLE, //M
UNCHARMABLE, //C
UNSTUNABLE, //N
UNSNAREABLE, //I
UNFEARABLE, //D
IMMUNE_MELEE, //A
IMMUNE_MAGIC, //B
IMMUNE_FLEEING, //f
IMMUNE_MELEE_EXCEPT_BANE, //O
IMMUNE_MELEE_NONMAGICAL, //W
SPECATK_MAXNUM
//X,Y,Z are old interactive NPC codes
};

[Rhodan]

enum {
};

Perfect, thank you!