This is a question related to a very specific situation : I had an idea about an unorthodox build for an ape animal companion. Animals only have melee attacks by default, and even the rules mention that teaching an intelligent primate to use crafted weapons may not incline it to use them.
So the main element of my build idea is the use of improvised weapons, since hitting something hard with a big stick is way easier than wielding a sword, and throwing a rock is way more intuitive than archery.
There is one thing that got my attention : something as basic as a club (a non-masterwork club is just a piece of wood worth 0 gp) is considered a simple weapon. For most classes, this isn't a problem, but what about an ape that learnt to use improvised weapons ? Does it take the -4 non-proficiency penalty when using a simple branch as a club, or can an exception be made ?
Best Answer
The difference between a simple and an improvised weapon is that the simple weapon is manufactured/designed to be wielded as a weapon. It might have a grip, a sharp edge, metal studs embedded into it or just have a pointy piece of flint on the end but its primary purpose is as a weapon.
Improvised weapons are everything else. Rocks, branches, stools, pumpkins, books and even small animals can be used to smack an opponent around the head but as it's not what they are designed for they count as improvised.
If you went down the improvised weapon proficiency route then you could still wield a heavy stick effectively like a club and with basically the same stats.
Catch Off Guard would remove the penalty in melee and Throw Anything would let you chuck it at enemies too. This also gives the benefit of being able to use almost any item you come across as a potentially lethal weapon.
This doesn't let you use Simple, Martial or Exotic weapons however, you'd still have a -4 penalty with them, although a 'simple branch' is always going to be an improvised weapon and not a club anyway.
Alternatively, you could just use the Simple Weapon Proficiency feat, use a real club and save a lot of bother.