NPC special body types?

[ChaosSlayer]

I swear I saw it somewhere but I been searching for an hour and I can't find it again.

I am looking for guide how to set up special body types which make thigns like:

make NPC immune to damage unless your weapon is magical (like wisps and ghouls are)

NPC who is spell immune
NPC immune to all damage , except bane

etc

NOTE- i am NOT reffering to Body Types like animal, undead etc.

all I found is a wierd "W" entry in all willowisps npcspecialattk field (PEQ DB) which dot not match with any of those that listed:

E => Enrage
F => Flurry
R => Rampage
S => Summon
T => Triple Attack
Q => Quadruple Attack
U => Unslowable
M => Unmezzable
C => Uncharmable
N => Unstunable

(as you see there is no W here...)

oh yeah the SEARCH feature is REALY NOT WORKING - i picked a few words from posts themselves and plug them into the Search- no matches found =)