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It pecifically doesn't work with 2H weapons.
In theory, if it did work, yes, the Greatsword would do damage as a Huge-sized weapon (Impact makes a Medium-sized Greatsword do damage as a Large one, a Large-sized Greatsword do damage as a Huge one, etc.), but it doesn't work.
Ahh that would be part of it. But he can still apply impact and use the large sword, right? So we would take a -2 to attacks, but still deal damage as though it was a huge weapon?
I would guess this would advance it to a 4d6?
Yes, but a Medium-sized character can't wield a Large-sized 2H at all unless he has a level of the Titan Fighter Fighter archetype.

kestral287 |
Right I get that the lace won't work - he won't like that. However, can he still apply the Impact enhancement to a large weapon?
Sure. Heck, you can apply Impact to a Colossal weapon if it suits your fancy.
Wielding an oversized weapon, however, is an entirely separate question.

DM_Blake |

If he's medium, he needs to use a medium 2H weapon, not a large one - it's too much effort for him to use it.
There are ways around that, such as Titan Fighter as suggested by Seranov, but without getting around it, he would only be able to use a medium greatsword so the Impact property makes it do damage as a large greatsword.

Protoman |

Yes he can apply impact to a large weapon. A +1 large impact bastard sword would do 3d8 damge. With effortless lace, there's no -2 penalty to attacks from being one size larger than a medium size wielder.
In general, impact isn't a big deal. +2 enhancement (minimum of an additional +16,000 gp from a base +1 weapon) isn't exactly cost-efficient for an additional average damage increase of 4.5.

Caryth Derellis |

Yes he can apply impact to a large weapon. A +1 large impact bastard sword would do 3d8 damge. With effortless lace, there's no -2 penalty to attacks from being one size larger than a medium size wielder.
In general, impact isn't a big deal. +2 enhancement (minimum of an additional +16,000 gp from a base +1 weapon) isn't exactly cost-efficient for an additional average damage increase of 4.5.
I suppose it is more worthwhile if you have a weapon with a high crit range, though.

DM_Blake |

Right I get that the lace won't work - he won't like that. However, can he still apply the Impact enhancement to a large weapon?
Edit: You cannot, under any other conditions, use a large weapon if you are not a titan mauler? I thought you would simply take a penalty on attack rolls?
Here's the rule you're looking for:
The measure of how much effort it takes to use a weapon (whether the weapon is designated as a light, one-handed, or two-handed weapon for a particular wielder) is altered by one step for each size category of difference between the wielder's size and the size of the creature for which the weapon was designed. For example, a Small creature would wield a Medium one-handed weapon as a two-handed weapon. If a weapon's designation would be changed to something other than light, one-handed, or two-handed by this alteration, the creature can't wield the weapon at all.
So a medium human can wield a large dagger which raises the effort to be that of a one-handed weapon. Or he can wield a huge dagger which raises the effort to that of a two-handed weapon. Or he can wield a large longsword which raises the effort to that of a two-handed weapon.
But if he tries to wield a large greatsword, it raises the effort to something more than two-handed and due to the bolded part of that quote, he cannot do it at all.

Caryth Derellis |

Caryth Derellis wrote:Right I get that the lace won't work - he won't like that. However, can he still apply the Impact enhancement to a large weapon?
Edit: You cannot, under any other conditions, use a large weapon if you are not a titan mauler? I thought you would simply take a penalty on attack rolls?
Here's the rule you're looking for:
Pathfinder SRD, Equipment, Weapons, Weapon Size wrote:The measure of how much effort it takes to use a weapon (whether the weapon is designated as a light, one-handed, or two-handed weapon for a particular wielder) is altered by one step for each size category of difference between the wielder's size and the size of the creature for which the weapon was designed. For example, a Small creature would wield a Medium one-handed weapon as a two-handed weapon. If a weapon's designation would be changed to something other than light, one-handed, or two-handed by this alteration, the creature can't wield the weapon at all.So a medium human can wield a large dagger which raises the effort to be that of a one-handed weapon. Or he can wield a huge dagger which raises the effort to that of a two-handed weapon. Or he can wield a large longsword which raises the effort to that of a two-handed weapon.
But if he tries to wield a large greatsword, it raises the effort to something more than two-handed and due to the bolded part of that quote, he cannot do it at all.
Thank you!

chbgraphicarts |

I mean... he's only doing 3d6 damage without Impact. WITH Impact it's 4d6 19-20/x2.
That's pretty nasty, but it's not as bad as a spellcaster.
So, if he has a +1 Impact Large Greatsword, which costs about 18,500gp, that means he's somewhere around lv8 or lv9.
So at lv9 he's throwing around 4d6+Str damage.
Any character with a Wand of Scorching Ray is doing 4d6 per round and bypassing both DR and Armor as early as lv4/lv5.
At lv9, Full spellcasters are throwing around 4th and 5th level spells, 6/9 spellcasters are hucking 3rd level spells.
Just tell your player to run a Titan Mauler with a Large Bastardsword, Large Falcata, or Large Katana.

kestral287 |
Protoman wrote:I suppose it is more worthwhile if you have a weapon with a high crit range, though.Yes he can apply impact to a large weapon. A +1 large impact bastard sword would do 3d8 damge. With effortless lace, there's no -2 penalty to attacks from being one size larger than a medium size wielder.
In general, impact isn't a big deal. +2 enhancement (minimum of an additional +16,000 gp from a base +1 weapon) isn't exactly cost-efficient for an additional average damage increase of 4.5.
On a high-crit weapon I'd take the +2 long before Impact. It would be a loss of ~2 damage (1.5 Greatsword, 2.5 Large Bastard Sword) in exchange for +2 to hit-- and +2 to hit means not only more damage but more confirmed criticals. That's a way bigger deal than some piddly two points of damage.
Unless you can leverage a lot of size increases at once-- a Titan Fighter with an oversized Bastard Sword who picks up Powerful Build (meaning we're into 3rd party already), Impact, and has a way to grow Large to use a Colossal-equivalent Bastard Sword, or one of a couple Druid builds that use the Behemoth Hippo for its amusingly high-dice bite attack-- damage dice just don't matter all that much.