Metamagic feats only stack if they say they do so specifically, however the Alchemist discovery doesn't reference the feat at all.
Yes they would stack.
Also note that this does not qualify for the funky-beans doubling rule. In this case the duration would actually be four times longer.
PS: The paizo site explodied on me this morning. Maybe some of that got on your original post. Sorry, mate!
They only hold up is if you GM will allow you to metamagic extracts since they aren't techniclly spells.
If he does there is a trait you could use on mage armor to extend it for no extra cost.
Though now that I think about it I don't think alchemist get mage Armor.
Like I said Meta-Magic and extracts can get wonky since they aren't technically spells I allow it in my games but I also let the alchemist qualify for other item creation feats as well.
I realize that and i realize the alchemist could take the feat. However it would be kinda pointless to take the feat only to apply it to his potions.
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Don't think your allowed to simply add metamagic effect with the ignore rule since that for preqs.
Thats not a preq its a bonus from having a feat.
And even if it was i just noticed this.
Note that all items have prerequisites in their descriptions. These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item's creator (although access through another magic item or spellcaster is allowed). The DC to create a magic item increases by 5 for each prerequisite the caster does not meet. The only exception to this is the requisite item creation feat, which is mandatory. In addition, you cannot create potions, spell-trigger, or spell-completion items without meeting its prerequisites.
So you have to have all the prerequisites for making a potion to begin with.
They stack for x3 the normal duration.
Benefit: An extended spell lasts twice as long as normal. A spell with a duration of concentration, instantaneous, or permanent is not affected by this feat.Benefit: A number of times per day equal to his Intelligence modifier, the alchemist can cause any potion he drinks that does not have an instantaneous duration to function at twice its normal duration. This does not apply to extracts.
They run for x4 the normal duration. You don't use funky-beans math on multipliers when they apply to real world dimensions like time or distance. In this case, 2x2 = 4.
Yep the other rules only apply to multiplying rolls.
Benefit: An extended spell lasts twice as long as normal. A spell with a duration of concentration, instantaneous, or permanent is not affected by this feat.Benefit: A number of times per day equal to his Intelligence modifier, the alchemist can cause any potion he drinks that does not have an instantaneous duration to function at twice its normal duration. This does not apply to extracts.
From this I conclude they do not stack. Each effect states that it specifically doubles the normal duration, not the current duration.
But the normal duration of a potion of extended mage armor (CL 5) is 10 hours.
You're trying to poach scrambled eggs here. If one egg recipe tells you to scramble an egg and some other egg recipe tells you to poach them, are you going to write to the authors saying that the egg recipe didn't work because when you tried to poach it it was already scrambled? No, you can't do that.
The normal duration of a CL5 mage armour is 5 hours, and each effect seeks to altar THAT variable.
Maybe they should be using the same verbage as creating items, but it just doesn't sound good:
E.G. An extended spell lasts twice as long as the base duration.
E.G. Extend Potion ... function at twice its base duration.
But the normal duration of a potion of extended mage armor (CL 5) is 10 hours.
Can you potion mage armor?
I thought no personal spells?
mage armor isn't a personal spell
Mage Armour isn't even an Alchemist spell, but I don't think the spell choice is the issue here.
If you read above they made provisions for that by acquiring an extended one from another wizard.
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Put this in perspective here, the extended version of a spell is generally not much more appealing than the equivalent potion with increased caster level version of the spell (often worse).
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Mage armor extended (6 hours duration):
50gp x 3 x 2 = 300 GP
Mage Armor, caster level 6 (6 hours duration)
50gp x 6 x 1 = 300 gp
Mage Armor, caster level 5, extended (10 hours duration)
50gp x 5 x 2 = 500 gp
Mage Armor, caster level 10 (10 hours duration)
50gp x 10 x 1 = 500 gp
Barkskin extended (100 minutes, +2 NA bonus)
50gp x 3 x 5 = 750 gp
Barkskin at CL 7 (70 minutes duration, +3 NA bonus)
50gp x 2 x 7 = 700 gp
If there is a 'sweet' spot is here, I'm not seeing it.
Edit: I'm sure there are some combos that have a marginal edge advantage, but it's definitely not a huge advantage.
so what if you pop an enhancement elixir (or whatever it's called. it's an alchemical extract that empowers or extends anything you drink) then drink an extended potion and extend it with the discovery? i don't think any of them reference the others and say they don't stack.
if that means X8 duration then... wow. just wow.
Amplify elixir + enhance potion discovery + potion 1 hour/level at CL 20th = 80 hours!
Yes, extend potion discovery....too many 'e''s....lol