Pick Critical Specialization Clarification

[Ravingdork]

Pick Critical Specialization: The weapon viciously pierces the target, who takes 2 additional damage per weapon damage die.

Excluding multiplication, does a major striking great pick do 5d12+10 base damage on a crit, or only 5d12+8?

[Xenocrat]

8. You only have four “weapon” dice.

[HammerJack]

The Damage rules (page 276 in PC1) answer this for everything that involves your number of dice.

Quote:

Counting Damage Dice

Effects based on a weapon's number of damage dice include only the weapon's damage die plus any extra dice from a striking rune. They don't count extra dice from abilities, critical specialization effects, property runes, weapon traits, or the like.

So if you had a Major Striking great pick, critical specialization, and no static modifier to damage, you'd have:

Hit: 4D10
Crit: (4d12)*2 + 1d12 + 8

[Finoan]

Also, don't multiply the crit spec bonus damage. Damage that only happens on a crit is not doubled from the crit.

HammerJack's value looks right to me.

[Trondster]

If you have critical specialization on a pick, you do the following damage (with +0 in strength):
A regular great pick(one die):
Hit: 1d10, Crit: 2*1d12+1d12+2 = 3d12+2

Striking great pick (two dice):
Hit: 2d10, Crit: 2*2d12+1d12+4 = 5d12+4

Greater Striking great pick (three dice):
Hit: 3d10, Crit: 2*3d12+1d12+6 = 7d12+6

Major Striking great pick (four dice):
Hit: 4d10, Crit 2*4d12+1d12+8 = 9d12+8

So to answer your question: Before doubling it is 5d12+8, and after doubling it is 9d12+8, since only the first 4d12 are doubled.
You need special handling of the multiplication - so that you do not incorrectly multiply the added damage from a crit. A major striking great pick has four damage dice (4d10 on a regular hit), and so the pick crit spec adds +8 on a crit. The extra 1d12 from Fatal does not count as damage dice, and the extra 1d12 from Fatal and the extra +8 from pick crit spec are not doubled, since they come from a critical hit effect.
(But you do get the die size increase from Fatal before doubling.)

Edit: clarified.

[Finoan]

And if I am accounting for everything on an example Dragon Instinct Barbarian at somewhere around that level, I am seeing:

STR +6
Greater Weapon Specialization (with master proficiency in the weapon): +6
Rage (with Greater Weapon Specialization): +16
Major Striking rune.

Hit: 4d10 +6 +6 +16
Crit: (4d12 +6 +6 +16)x2 +1d12 +8

[Trondster]

Finoan wrote:

Hit: 4d10 +6 +6 +16
Crit: (4d12 +6 +6 +16)x2 +1d12 +8

And for funsies - when you get to Major Striking, the damage from Deadly 1d10 in an Ogre Hook slightly surpasses the Fatal 1d12 from Greatpick in damage. Using your example:

Major Striking Greatpick (1d10, Fatal 1d12):
Hit: 4d10 + 6 + 6 + 16 = 4d10 + 28, average 50.
Crit: 2*(4d12 + 6 + 6 + 16) + 1d12 + 8 = 9d12 + 64, average 122.5

Major Striking Ogre Hook (1d10, Deadly 1d10):
Hit: 4d10 + 6 + 6 + 16 = 4d10 + 28, average 50.
Crit: 2*(4d10 + 6 + 6 + 16) + 3d10 + 8 = 11d10 + 64, average 124.5