Finding it tough to locate in-era mentions of this. What I have found:
1) By 2003, merchants I think were unequivocably uncharmable:
Quote:
Stuff of level to DC is rarely marked uncharmable. It's either old world stuff when charming wasn't an issue or else specifically placed there to be DC'd. The exception to this tends to be merchants...can't charm them period[You must be logged in to view images. Log in or Register.]
http://web.archive.org/web/200401131...p?p=835502&
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2) This thread from April 2002 isn't too far out of era, and it's pretty explicit (also it seems maybe Iksar NPCs were immune to charm, is that true on P99?):
Quote:
Difficult to do solo:
1. Vessel: Iksar are immune charm.
2. Tangrin: He stuns and nothing that is charmable comes close to his level
3. Hate: Revenants, you need a FD puller to break the revs that actually drop anything
4. Verina Tomb: I believe others have posted that the guards are not charmable and merchants are not so there is not much left.
5. Cazel: Merchants are not charmable and this guy has an insane regen. Fully loaded with Necro and Shaman dots his hp do not drop.
6. Tangrin: Iksar are not charmable and the guards are the only thing in the zone that might be able to stand up to his punishment.
7. Shissar: You have to pull the Shissar out of the temple occupied by a bunch of HTing mobs. A Dire Charmed pet would die quickly followed a bunch of Amy Knights descending upon you
Hmm ... looking back it all seems pretty negative
So, you can pretty much solo the parts that are soloable by everyone
If you do manage to solo one of the above, let us know ... that would be quite interesting!
Regards,
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Master Zanithar TideBreaker
Phantasmist
Cazic Thule
http://web.archive.org/web/200204290...&f=17&t=000790
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However as DMN says maybe this was a late-era change, such as around the time of the Kael patch message.