Ok, came up against something odd today while playing Arkham base + CoTDP.

Amanda Sharp and Ashcan Pete are playing against Nyarlathotep, and he is about two doom tokens from awakening. We've only been able to manage getting two gates sealed, but pete is sitting on like 6 or 7 clue tokens anticipating the inevitable final battle. Amanda has quite a high lore skill and drew +1 Lore skill card and the Revelation of Script spell that gives +3 to non spell lore checks for a turn for zero sanity cost. I am just waiting for Narly to wake up so I figure what the hell lets hang her out at the Silver Twilight lodge for a few turns because I think its awesome and wanted to explore some of the encounters more. After a turn or two she gets a membership and the next encounter is a CoTDP encounter card that reads as follows: (I tried to look up a picture on Arkham Horror Wiki but couldnt find one)

"A gorgeous youth invites you into a meditation chamer. If you go in, you must lose a total of 4 spells or Stamina, divided up as you choose, but you may search the Exhibit Item deck for the Triune Mask card and take it. If you do not go in, the young witch casts a hex upon you, and you are Barred from French Hill ."

So I am looking through the Exhibit Items deck trying to figure out which way I want to go in that encounter but I can't find the Triune Mask. I get a little pissed and figure either one of two things has happened, I failed to pick up one card from CoTDP and its still in the box, or FFG made a misprint and I never got the card in the set. So I check the box, then go on AH Wiki to see if the card even exsists, and sure enough there is no "Triune Mask" in the Exhibit items deck in the first place.

So I am wondering how you guys who play a lot of CoTDP have dealt with this situation (I AM LOOKING AT YOU TIBS). I am thinking maybe the card should read mask of three fates, but if you think about it any one of the masks seems to have "triune" abilities since it grants you 3 investigator's special powers.

I am going to rule for now that I get to pick which mask I want and get back to the game, but I am curious how others would rule on this?

It's the Mask of Three Fates.

(oddly, wasn't mentioned in the KW answer thread).

I decided to just get barred from French Hill streets as I didnt want to lose her Revelation of Script spell for use in the final battle with Nyarlathotep. We won in the end, but she was devoured, Pete barely finished off Nyarlathotep with 2 clue tokens remaining.

I guess I will post the question to the FAQ project thread.

It's already in the FAQ (official, not the "Complete FAQ thread):

"The Triune Mask/Mask of the Three Fates
One of the Inner Sanctum encounters instructs the player
to search the Exhibit Item deck for the “Triune Mask”
card. This should be the “Mask of the Three Fates” card
instead." (p. 6)