4 players, multiple sets for mythos?

[fanficwarper 0]

So say in theory you had a game with 4 players. Off the bat it says you need 2 core sets, and I think the same is for the deluxe expansions. Would the same hold true for the mythos packs then? (or Return to expansions as well?)

[DarkFate 70]

The reasons for needing 2 cores sets for 4 players is because there isn't enough player cards and possibly tokens in 1 for 4. There is also the issue of most player cards having only 1 copy of in 1 core so some people like to get 2 in order to complete the playset. 

All other expansions including the deluxe you only need 1 of. They give the full playset.

While this game is meant to be played with each players having their own collection, there is no problem with just 1 guy sharing his collection though except that he has to ensure there is enough player cards to go around.

Edited March 2 by DarkFate

[Iuchi Toshimo 230]

tldr: You can play 4 player with 2 Cores and 1 of everything else. The investigators in the Dunwich deluxe expansion is probably the best first purchase after a second core set. 

My wife and I play out of 2 cores and 1 of everything else. We can build every viable deck with no overlap, but we can't build, say, two guardians at the same time.

We play in groups of 3 or 4 and the other players have their own collections.

Building 4 decks out of one collection is certainly doable, if sometimes awkward. We are currently struggling to create teams to attempt The Dream Eaters, since my Wife and I need 4 decks built out of one collection, which is much harder than building only 2 decks. We could do some extra bookkeeping and swap cards out between scenarios, but we enjoy the challenge. However, Dream Eaters 4p out of one collection will likely require decklists and card swapping.

To accomplish this challenge of 4 decks from 1 collection, we basically separated investigators into single class buckets, not counting the stray hairs of some off class cards. For example, Mandy is a seeker and Carolyn is a guardian, despite their limited access to some other classes. Norman is clearly a Seeker/Mystic and so he's not part of this list. That's not saying those are good choices for this team building process, but it's a start. I'm sure everyone's list is different, but for example, maybe:

Guardian              Seeker                    Rogue                    Mystic                     Survivor

Mark                      Rex                          Finn                      Akachi                       Calvin

Carolyn                  Mandy                    Jenny                     Mateo                      Silas

 

So to build a team of 4, choose a person out of three different buckets. So: Finn, Akachi, and Calvin. Then the fourth team member can be anyone from the remaining buckets or a dual class character, so now Roland, Joe, and Lola are additional options. Maybe choose Roland. Lastly, just decide the little overlaps. Finn is probably the most disruptive to deckbuilding with his access to Survivor and Seeker, so build him last out of what's left. Note that this might lead to suboptimal builds.

Some Upgrades, like Charisma, are popular but also proxyable. Others upgrades would need to be discussed (Example: everyone can't upgrade into Ornate Bow since there is only 2 copies.) 

Then, if we were playing Dream Eaters, my wife and I would choose teams of 2 for Dream Eaters. Maybe Roland and Calvin for one team and Akachi and Finn for the other. 

Or we could go Rex, Jenny, Silas, Diana as a different team. Maybe Mark, Mandy, Finn, and Anges.  There is quite a bit of variety with a full collection right now.