[FULL] Le Règne de l'hiver

Brew Potion: Can a character with this feat create a potion of any spell he knows simply by adding +5 to the DC, even without preparing it?

No. When creating potions, the crafter must prepare and expend the spell used by the potion as part of its creation. This is an exception to the normal rules that allow a caster to skip one of the prerequisites for crafting an item by adding +5 to the DC.

Update: Page 549, in the Magic Item Creation rules, in the second paragraph, change the last sentence to read as follows.

In addition, you cannot create potions, scrolls, staves, wands, or any other spell-trigger or spell-completion magic item without meeting its prerequisites.

—Jason Bulmahn, 07/14/11

Crafting and Bypassing Requirements: What crafting requirements can you bypass by adding +5 to the DC of your Spellcraft check?

As presented on page 549 of the Core Rulebook, there are no limitations other than (1) you have to have the item creation feat, and (2) you cannot create potions, spell-trigger, or spell-completion magic items without meeting their spell prerequisites. So racial requirements, specific spell requirements, math requirements (such as "caster level must be at least three times the enhancement bonus"), and so on, are all subject to the +5 DC rule.

—Pathfinder Design Team, 02/22/13

Crafting and Spell Requirements: When crafting an item, can an arcane caster use a divine scroll to fulfill an item's divine spell requirement?

Yes. (Likewise, a divine caster could use an arcane scroll to fulfill an item's arcane spell requirement.)
However, the character has to be able to activate the scroll somehow as part of the crafting process. This probably requires the arcane caster to succeed at a Use Magic Device check to activate the divine spell. If the caster fails to cast the divine spell from the scroll, he makes no progress on the item that day unless he has another source for that divine spell (such as another copy of the scroll).

—Pathfinder Design Team, 02/22/13

Crafting and Take 10: Can I take 10 on the Spellcraft check to craft a magic item?

Yes.

—Pathfinder Design Team, 02/22/13