Alchemist Archetypes - Just trying to see if these archetypes stack or not

[Nightfall]

Would it be rule accurate to allow someone to try a Chirurgeon, Internal Alchemist, and Vivisectionist?

[Rynjin]

None of them seem to replace or alter the same class feature, so they should work.

Except maybe Internal Alchemist's Bonus Feats optional replacement to Discoveries and Vivisectionist's Rogue Talent replacement of the same.

[Cheapy]

It depends on whether Disease Resistance counts as modifying poison immunity. For homegames, I recommend yes, they can stack. For PFS, since there's some ambiguity, I recommend no, they do not stack.

[Nightfall]

Cheapy wrote:

It depends on whether Disease Resistance counts as modifying poison immunity. For homegames, I recommend yes, they can stack. For PFS, since there's some ambiguity, I recommend no, they do not stack.

This isn't for PFS. This is just for a game I'm running.

Rynjin wrote:

None of them seem to replace or alter the same class feature, so they should work.

Except maybe Internal Alchemist's Bonus Feats optional replacement to Discoveries and Vivisectionist's Rogue Talent replacement of the same.

I was under the impression they weren't per-requisites or class features. You can still get alchemist discoveries if you want. They are just extra.

[Rynjin]

They're ambiguous. If it's not for PFS I say allow it.

PFS goes by strict RAW except in certain cases I believe and this is a hard spot for that, but for home games it wouldn't break anything to allow those three together.