^Is there any combination of feats, archetypes etc that would allow this to be feasible? This is mostly for curiosity's sake, so I have no restrictions about 3rd party stuff and weird races.
Would some combination of Titan Mauler barbarian & Titan Fighter...fighter work? A magic weapon property that I'm not remembering?
Like I said, this is just for fun,m so please, go nuts. :)
It's easy. Grow to huge size and you can wield a large greatsword in one hand with a -2. A 14th level Goliath Druid can wildshape into a huge giant. Giant Form II will also allow huge giants. An 6th level ape shaman can wildshape into a huge ape.
OK. Yes if you take Tiefling and their Over Sized Limb alternate racial trait, you can gain arms that can Wield Large Size weapons without penalty. This means a Medium Character could wield a Large Greatsword in 2 hands, when before it would be impossible. Actually this part is debated. it's not clear if you can now use 2 handed Large weapons. but it for sure negates the -2 to wield a larger than your size weapon.
It doesn't allow you to overcome the handiness rules. It only removes the inappropriately-sized penalties incurred from using Large-sized weapons.
You could use this on, for example, a Large Bastard Sword, but a Large Greatsword requires 3 hands to use for a Medium Character, which means you can't wield it at all.
@ Nate Z: Monkey Grip feat from 3.X could work the way you want it to.
If you want to take a loose definition of wield, a telekineticist could use one as his object when using kinetic blade or kinetic whip.
A 2nd level titan mauler barbarian (Jotun Grip) under the effect of enlarge person can wield a Large greatsword (appropriately sized, as they are Large) with one hand (at a -2 penalty).
If you mean a Medium sized creature using a Large two-handed weapon without changing size or using telekinesis, no. Not in Pathfinder.
Teifling with the alternate trait for large hands, on the 1-100 roll chart.
Titan Mauler Barbarian.
It doesn't allow you to overcome the handiness rules. It only removes the inappropriately-sized penalties incurred from using Large-sized weapons.
You could use this on, for example, a Large Bastard Sword, but a Large Greatsword requires 3 hands to use for a Medium Character, which means you can't wield it at all.
@ Nate Z: Monkey Grip feat from 3.X could work the way you want it to.
Actually, Near as I can tell Alric's suggestion should work.
At 2nd level, a titan mauler may choose to wield a two-handed melee weapon in one hand with a –2 penalty on attack rolls while doing so. The weapon must be appropriately sized for her(...)
You have over-sized limbs, allowing you to use Large weapons without penalty.
A large greatsword would be appropriately sized for a medium-size tiefling with the Over Sized Limb racial feature. Jotungrip lets you wield an appropriately sized two-handed weapon in one hand. Presto, you're one-handing a large two-handed weapon.
However many GMs will say no to picking racial traits off a random list. Another option is to use Enlarge Person or take a level of Titan Fighter for the Giant Weapon Wielder class feature, which has roughly the same function as Over-Sized limbs.
At 1st level, a titan fighter can wield two-handed melee weapons intended for creatures one size category larger than himself, treating them as two-handed weapons. He takes an additional –2 penalty on attack rolls when using an over-sized two-handed weapon.
It doesn't allow you to overcome the handiness rules. It only removes the inappropriately-sized penalties incurred from using Large-sized weapons.
You could use this on, for example, a Large Bastard Sword, but a Large Greatsword requires 3 hands to use for a Medium Character, which means you can't wield it at all.
@ Nate Z: Monkey Grip feat from 3.X could work the way you want it to.
Actually, Near as I can tell Alric's suggestion should work.
At 2nd level, a titan mauler may choose to wield a two-handed melee weapon in one hand with a –2 penalty on attack rolls while doing so. The weapon must be appropriately sized for her(...)You have over-sized limbs, allowing you to use Large weapons without penalty.A large greatsword would be appropriately sized for a medium-size tiefling with the Over Sized Limb racial feature. Jotungrip lets you wield an appropriately sized two-handed weapon in one hand. Presto, you're one-handing a large two-handed weapon.
However many GMs will say no to picking racial traits off a random list. Another option is to use Enlarge Person or take a level of Titan Fighter for the Giant Weapon Wielder class feature, which has roughly the same function as Over-Sized limbs.
At 1st level, a titan fighter can wield two-handed melee weapons intended for creatures one size category larger than himself, treating them as two-handed weapons. He takes an additional –2 penalty on attack rolls when using an over-sized two-handed weapon.
The Large Greatsword isn't sized for a Medium Creature. The Jotungrip ability would not apply.
This is like saying "I can use a Large-sized Kukri with Slashing Grace." Any sane person will reference you this portion of the text:
The weapon must be one appropriate for your size.
There is uncannily similar text in Jotungrip.
Being able to ignore a size penalty you've incurred means that you are incurring an inappropriate size weapon penalty, which means it's not appropriately sized for you, the holistic definition of "inappropriately sized," which means Jotungrip does not function with a Large Greatsword.
Not even Titan Fighter ignores the "inappropriately sized" clause, it just says that he can use a weapon one size larger than himself, and incurs an additional (which means extra) -2 penalty to hit, which means he's still suffering from inappropriately sized weapons, which means said weapon would still not function with Jotungrip.
I'd say the whole point of Over-sized limbs and Giant Weapon Wielder is that it lets you to treat Large weapons as appropriately sized, but we're obviously coming at this from diametrically opposite positions.
Rather than argue I think we should we agree to disagree and suggest that OP asks his GM how he interprets it.
If you'd like to discuss the rules elements of Oversized limbs/Giant Weapon Wielder (which I find interesting) you should make a thread in the Rule Questions forum. :)