So, are any feats needed to make masterwork armor/weapons and Alchemical items? Just asking because I randomly found some feats that said they were needed, individually, to make master work armor, master work weapons, or alchemical items

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And, infusions don't seem to be arcane in nature: so could my character use heavy armor without miscasting?
Also, I think you're giving out a bit much for weapon proficiency, Sure, if you're buying it, it's one weapon per a feat, but by this logic I could, if I wanted to Cheese the nine hells out of this system, If I played a fighter and then, at level 2, get a level of barbarian.
I could then trade both simple and martial weapon proficiency for an extra, by what your giving out here, 4 feats. This is amusing I don't trade off the martial/simple weapon proficiencies from fighter as well.
Kicker is I'm also getting to choose one weapon to keep each time I trade off a proficiency.
Oh, I forgot, their is also armor to either keep or toss off. So their is an other three easily off loaded, redundant, class features granted by barbarian.
Point I'm making here: second level in fighter: +1d10 hit dice, 2+int mod skill points, +1 fort save +1 combative feat, +1 BAB. But a level in barbarian: +1d12 hit dice, 4+int mod skill points, +2 fort save, +7 feats (by trading off redundant class features), Fast Movement, Rag and, for a kicker: Barbarians have a larger class skill pool to play with. Meaning: if your going to use a fighter, you're best off picking up a level of barbarian no matter what, its a flat out better level advancement

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Keep in mind, I love the idea of trading around class features, expressly redundant ones, but this set up already favors multi class character with out the cheese of being able to drop one weapon proficiency list for two feats. this means any given character who gets a new basic class gets two + feats on a sigle clase character.
All I'm saying here is, you might want to be a bit more stingy on what you're giving out for weapon proficiencies.
Cheese can happen. Then again, the one classes that can't easy dip into this cheese are spell casters, so who knows, it might be balancing out the nukers latter on XD
~Teh Annoying Newbie
Addon: Could I use Education instead of the Bonus 2/2 feat? (it makes all Knowledge skills class skills and gives +1 to two knowledge skills)