again with the alchemist questions.

[zainale]

so the Promethean Alchemist loses its class ability mutagen. but it would not take away mutagens from other classes like mutagenic mauler or the Unstable Mutagen (Trait Magic)?

and the way beast morph is written
At 3rd level, a beast morph’s mutagen causes him to take on animalistic features

it would change the way the mutagen you have works. so you could take both Promethean Alchemist and beast morph?

[Rushley son of Halum]

If an archetype changes a class ability then you cannot also take another archetype that changes the same class ability or feature.

An archetype impacts the class you take it for, so it cannot be used to change the class features of another class.

As for taking an alchemist discovery to alter a mutagen when the mutagen itself is sourced from another class, I would also say no. A few classes and archetypes give features that specifically impact other classes, but I don't think discoveries would work that way.

So in short. No. More to the point actually the Promethean alchemist actually prohibits you from even taking the mutagen discovery so while id let you take a level of mutagenic mauler I would use that as the reasoning for discoveries not impacting on it.

[GreenMandar]

No

Advanced Player's Guide wrote:

A character can take more than one archetype and garner additional alternate class features, but none of the alternate class features can replace or alter the same class feature from the core class as another alternate class feature. For example, a paladin could not be both a hospitaler and an undead scourge since they both modify the smite evil class feature and both replace the aura of justice class feature. A paladin could, however, be both an undead scourge and a warrior of the holy light, since none of their new class features replace the same core class feature.

As you pointed out the Promethean Alchemist takes away the mutagen ability from the alchemist. The Beastmorph archtype obviously adds to the mutagen abilities and specifically calls out that it replaces persistent mutagen with Grand Beastform Mutagen. Getting the mutagen ability from a different class wouldn't change how these archtypes aren't allowed together.

Also the Unstable Mutagen doesn't grant a character the Mutagen ability, it allows a character who already has Mutagens to make one Unstable Mutagen a day.

[zainale]

At 1st level, a mutagenic mauler discovers how to create a mutagen that she can imbibe in order to heighten her physical prowess, though at the cost of her personality. This functions as an alchemist's mutagen and uses the brawler's class level as her alchemist level for this ability (alchemist levels stack with brawler levels for determining the effect of this ability). A mutagenic mauler counts as an alchemist for the purpose of imbibing a mutagen prepared by someone else.

[Rysky]

Can you multiclass Brawler (Mutagenic Brawler) and Alchemist (Promethean Alchemist)? Yes.

Can you do so and trade away the Mutagen from Mutagenic Mauler in order to qualify for Beastmorph? No.

If you're multiclassed can you take Discoveries from your Promethean Alchemist to modify your Mutagen from Mutagenic Mauler? Eh, maybe?

I haven't seen a rule strictly forbidding that (if anyone has feel free to point it out) so I'd allow it in the games I run.

[zainale]

all your trading away is swift alchemy not your mutagen ability so it should not matter where your mutagen origin is from and mutagenic mauler counts as an alchemist so your alchemist lvls should be able to modify your currant mutagen

[Rysky]

Beastmorph trades out Swift Alchemy, but Promethean Alchemist trades out Mutagen. Beastmorph's unique Mutagen abilities only apply to the Alchemist's mutagens, not Mutagens gained from other sources.

Different sources of Channel Energy do not stack.

Different sources of Mutagen do not stack.

[zainale]

it does not say the alchemist's mutagen it says beastmorph's which means you should have one and a mutagenic mauler has a mutagen which would be effected by the beastmorph improvement.

At 1st level, a mutagenic mauler discovers how to create a mutagen that she can imbibe in order to heighten her physical prowess, though at the cost of her personality. This functions as an alchemist's mutagen.
//
it functions no different from an alchemist's mutagen. there for you should be able to modify your mutagen with the archetype beastmorph. i have pointed out before that it just says the beastmorph's mutagen. not the beast morphs mutagen created by the alchemists class feature.
------
and uses the brawler's class level as her alchemist level for this ability (alchemist levels stack with brawler levels for determining the effect of this ability).

A mutagenic mauler counts as an alchemist for the purpose of imbibing a mutagen prepared by someone else.
//
both of there further state that the mutagenic brawler is an alchemist when it comes to his creation of his mutagen
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[Rushley son of Halum]

Do not write posts like that. It's poor formatting and frankly annoying.

The Mutagenic mauler uses his Brawler level as his effective alchemist level for the mutagen's advancement. This would not normally mean they stack. However I note that this archetype seems to be an exception to that rule.

I would however maintain that the archetype of one class cannot influence the class features of a different class. So a Cleric archetype cannot influence the channeling of a Life Oracle for example.

You're right in saying that the Beast morph doesn't explicitly replace the mutagen ability. But this was also created when there were no archetypes that removed the mutagen ability. There is however a precedent to say that a mutagen cannot be influenced by multiple class features or discoveries.

Ultimately while the levels of the brawler and alchemist stack for the determining the time period of the mutagen I think that is where the link ends. If this is a home game feel free to discuss it with your GM however rules as written this simply shouldn't work.

There are a few exceptions to what i've outlined above, however they are explicitly stated in the rules. These apply to a few very specific prestige classes and certain arcane casting archetypes. But Generally you cannot alter a classes core features with the archetype from a different class. Thats not how the rules work.

[zainale]

also thank you GreenMandar for pointing out that unstable mutagen does not give you a mutagen use. i missed that.

[GreenMandar]

You are very welcome.
But.. sorry, at 14th level the Beastmorph archtype replaces Persistent Mutagen with Grand Beastform Mutagen. Persistent Mutagen is removed along with all mutagen abilities from the Promethean Alchemist archtype. You can't stack archtypes that modify/remove the same class abilities. Sorry I know you want this to work, but it doesn't.

[zainale]

was planing on taking the prestige class master chymist after reaching lvl 13. and not taking any more alchemist classes so that should not be an issue. it also fits the back story for my character. that's
2 lvls (mutagenic mauler)
13 lvls alchemist (Beastmorph/Promethean Alchemist)
5 lvls master chymist.
in that order.
it also seems that the prestige class is something my DM wants to do to my character anyways.

[Gulthor]

It doesn't matter what level you hit or are planning on reaching. You can't trade the same ability away more than once. Archetypes are all-or-nothing, total buy-in.

And even if it didn't, you'd still need an exceptionally lenient GM to allow you to pull this off anyway.

EDIT: But if your GM already gave you the okay, why bother asking?