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http://paizo.com/pathfinderRPG/prd/spells/enlargePerson.html#_enlarge-perso n
"Multiple magical effects that increase size do not stack."
Still 3d6
Those 2 effects do stack. Only one of those (enlarge person) is actually changing the size of anything. Lead blades deals damage "as if one size category larger" but doesn't actually increase the size of the weapon.
So, the answer would be 4d6. Once you reach 3 dice of damage you just start adding dice.

Robert A Matthews |

Prok wrote:http://paizo.com/pathfinderRPG/prd/spells/enlargePerson.html#_enlarge-perso n
"Multiple magical effects that increase size do not stack."
Still 3d6
Those 2 effects do stack. Only one of those (enlarge person) is actually changing the size of anything. Lead blades deals damage "as if one size category larger" but doesn't actually increase the size of the weapon.
So, the answer would be 4d6. Once you reach 3 dice of damage you just start adding dice.
This.

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1d2 => 1d3 => 1d4 => 1d6 => 1d8 => 2d6 => 3d6 => 4d6 => 6d6 => 8d6 => 12d6 => 16d6 => 24d6
Damage dice roughly doubles every other size increase, whether natural or manufactured. Exceptions exist.
To my knowledge, this is incorrect. Once you reach 3d6 you just add a d6 each time if the damage due to size increases. Although I am unable to find anything in the rules that covers this.

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That is incorrect.
A casual glance at the damage dice table in the CRB shows that damage roughly doubles every other step, an idea which is reinforced with the Improved Natural Attack feat chart, and again via the spell Strong Jaw, and still yet again by examples listed in the Bestiaries (like this one).

Robert A Matthews |

Nefreet wrote:To my knowledge, this is incorrect. Once you reach 3d6 you just add a d6 each time if the damage due to size increases. Although I am unable to find anything in the rules that covers this.1d2 => 1d3 => 1d4 => 1d6 => 1d8 => 2d6 => 3d6 => 4d6 => 6d6 => 8d6 => 12d6 => 16d6 => 24d6
Damage dice roughly doubles every other size increase, whether natural or manufactured. Exceptions exist.
Actually he's right. They didn't keep the entire table intact when they created pathfinder. You can see the entire table on the 3.5 SRD.

Oliver Veyrac |

Joe Shmoe is carrying a Greatsword that deals 2d6 points of damage and casts enlarge person. Increasing his weapon and his size by one size category. Joe then casts Lead Blades to increase his weapon damage by "increasing the momentum and density of your melee weapons when he strikes a foe."
The rules for size bonus' are as follows:
"In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell."
Lead Blades:
"Lead blades increases the momentum and density of your melee weapons just as they strike a foe. All melee weapons you are carrying when the spell is cast deal damage as if one size category larger than they actually are. For instance, a Medium longsword normally deals 1d8 points of damage, but it would instead deal 2d6 points of damage if benefiting from lead blades. Only you can benefit from this spell. If anyone else uses one of your weapons to make an attack it deals damage as normal for its size."
All that this spell does is increase the "Momentum and density" it doesn't effect the size. If it increased the size of the weapon for example it would impose a -2 penalty to attack rolls. By the way the spell is written the rules allow it.