[RPG] Swift Alchethe and Potions

http://paizo.com/prd/magicItems/magicItemCreation.html

create magic items, spellcasters use special feats which allow them to invest time and money in an item's creation. At the end of this process, the spellcaster must make a single skill check (usually Spellcraft, but sometimes another skill) to finish the item. If an item type has multiple possible skills, you choose which skill to make the check with. The DC to create a magic item is 5 + the caster level for the item. Failing this check means that the item does not function and the materials and time are wasted. Failing this check by 5 or more results in a cursed item (see Cursed Items for more information).

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 magic items without meeting their spell prerequisites.

You can use spellcraft or craft(alchemy) for the final check to create the potion/oil, but the brew potion feat is still required.

Normal speed…

Assuming consistent Craft (alchemy) skill check results of 28, an eldritch poisoner alchemist that possesses a Craft (alchemy) skill bonus of +18 completes 504 sp of progress on a 4,000-sp dose of gray justice each 1/4 day, completing a dose in 8 days. If the GM allows this alchemist to make multiple Craft skill checks in a day, the alchemist can complete the dose of gray justice in but 2 days. (This progress is determined by taking 28 (the check's result) × 18 (the Craft (alchemy) skill check DC of the poison gray justice) = 504 sp.)

…Accelerating…

Were this alchemist confident or if the GM allows this alchemist to take 10 on this Craft (alchemy) skill check, the alchemist can accelerate this crafting time, adding +10 to the DC therefore making the Craft (alchemy) skill check DC 28 for the 4,000-sp dose of gray justice. That alchemist then completes 784 sp of progress on the dose of gray justice each 1/4 day, completing a dose in 6 days. If the GM allows this alchemist to make multiple Craft skill checks in a day, the alchemist can complete the dose in but 1 1/2 days. (This progress is determined by taking 28 (the check's result) × 28 (the accelerated Craft (alchemy) skill check DC of the poison gray justice) = 784 sp.)

…And full throttle with the feat Master Alchemist

The feat Master Alchemist makes this far faster. Such an alchemist can create a dose of gray justice in 1/4 of day even without accelerated crafting, the feat Master Alchemist making the poison's virtual cost (for the purposes of its time to create only) a mere 400 sp.

Notes

• The Advanced Player's Guide FAQ contains this brief exchange:

  For the purposes of an alchemist's class abilities, are poisons considered alchemical items?
  Yes.

  Thus the alchemist's extraordinary ability swift alchemy applies to poisons.

• Unlike D&D 3.5 which differentiates between real-word and in-game units, Pathfinder simply never uses real-world multiplying on rolls, and time needed to Craft isn't a roll. The combination of the extraordinary abilities swift alchemy and toxicology reduces the time to 1/4.
• The GM may mandate a creature can't make more than 1 Craft skill check per day. Try to persuade such a GM to change his mind.