You can, but you don't get the proficiency bonus to-hit.Can you wield a bastard sword by the rules without the exotic weapon feat?
I don't recall any rules on this, but I'd probably use my judgment as a DM. I'm guessing the answer is "Generally, No."And related question:
Can you wield a weapon that is one size too big or one size too small for your character?
As Obryn said, yes, you can wield a weapon that you don't have proficiency in, though you don't get the proficiency bonus to hit (although just a small +, it is noticeable ...)Can you wield a bastard sword by the rules without the weapon proficiency feat?
And related question:
Can you wield a weapon that is one size too big or one size too small for your character?
Except you only have stats for medium weapons.the enchant item ritual allows you to resize magic armours, without a component cost. I see no problem in extending this to weapons too.
Large-size weapons do exist, but only for the purposes of oversized PCs (bugbears). I don't remember where you find the information for making a weapon Large size, except for the Character Builder. Right now, it's just kind of an annoying thing where I have to avoid scrolling too far in that particular menu so that I don't hit the no-man's land of "re-print of the weapons table with the word 'Large' at the beginning of each line", included for the off-chance that my PC is of a race I'd never play.