Rules

[Skyrock]

• Level 12, PB28
• Generally all of 1st party 3.5 is fair game (re-fluffing and re-skinning is fine), as is my Ravenloft material and my other homebrew. (Exceptions: Artificer class, Leadership feat, Bloodlines (UA) and Item Familiars (UA) - and I reserve the right to ban d2 Crusaders and similar cheese) - Dragon Mag and Homebrew will be decided on a case-by-case basis.
  
• Hitpoints: First level full die size, then half die size +1 (d4 => 3, d6 => 4, d8 => 5, d10 => 6, d12 => 7).
• 2 bonus feats taken up at lvl1/12 respectively. Also note the extra feats available: https://www.d20pfsrd.com/feats/3rd-party-feats/petersen-games-feats/
• Chopping Down The Christmas Tree with WBL cut to 1/5. 1 1920s $ = 1 D&D gold piece. D&D price lists take precedent where the exist. (So $17,600 per lvl12 character barring Vow of Poverty, Aristocrat levels and other mods.)
  
• Fractional BAB / Saves are used (UA p.73)
• There are neither Favoured Classes, nor multi-classing restrictions (as for Paladins and Monks)
• Nightsticks cannot be stacked
• Every rank in Perform grants proficiency in one art form, as in 3.0 - not a separate Perform skill for every art form
• Diplomacy uses the Rich Burlew fix, except that synergies remain as usual and DC is 20+HD+Wis
  
• The applications of Open Lock are rolled into Disable Device
• There is one extra skill, Profession (Yog-Sothothery Philosopher). It is very useful, but makes you more susceptible to fear and madness (see next bullet point)
  
• Fearstacking works very different, and can lead to insanity or heart attacks: https://www.d20pfsrd.com/gamemastering/other-rules/variant-rules-3rd-party/petersen-games/insanity-and-dreams/ (Note: Class features, creature abilities etc that grant immunity to fear instead grant dread resistance. Dread resistance grants the creature a +5 bonus on saving throws against dread. In addition, when unaffected by dread, dread resistant creatures treat their starting dread stage as –2 rather than 0.)

Races

• PF Human (as 3.5 human but with +2 to any one ability score, essentially)
  
• Ghoul, Lovecraftian
  (click to show/hide)

  Lose: Feed on Flesh
  Gain: Consumptive Gift (as Helfarch), +1 to the DC of Ritualist rituals/features, count as Helfarch for prerequisites. May replace feat prereqs and bonus feats that only work with Helfarchs (like Lifedrinker Charge as prereq for Helfarch Ravager) with Ritual Study, ritual feats or racial feats (Helfarch)
• Abberations (probably best sourced from Osle's Monster Classes)

Armor
Armor is not used anymore in 1920s America. There are some surplus flak vests and steel helmets from WW1 floating around, but they are neither practical.
Characters with light/medium/heavy armor proficiency gain a armor bonus of +2/4/6, +1/3 per class level granting that proficiency. Unlike Dragonscale Husk this doesn't impede movement, but neither does it provide any of the other advantages of DSH like damage resistance.

• Flak Vest (vest slot): Maximum Dex bonus +2. +2 Reflex save. On a successful Reflex saving throw against an attack that normally deals half damage on a successful save, the wearer instead takes 1/4 damage. Slows down movement as medium armor. 40lb. $200.
• Steel Helmet (head slot): +1 Reflex save. -2 to Spot and Listen checks and to initiative. 5lb. $5.

Firearms
Use d20 Modern rules. Use this table to convert Purchase DCs to modern dollars, then divide by 20 to get the value in 1920s dollars. (E.g. a Pathfinder revolver (Purchase DC14) would be worth 350/20 = $17.50)

Thompson M1921 stats, $200

Spells
Note the extra spells in the world of H.P. Lovecraft: https://www.d20pfsrd.com/magic/3rd-party-spells/petersen-games/

Partial Gestalt
Partial Gestalt with the heterodox mix of 1//-, 2//6, 3//5 and 4//4. (PrCs will have their Tier gauged depending on entry.)
Note that there are no T1 and T2 base classes in this game.

Tier List:

(click to show/hide)

Tier 1: N/A

Tier 2: N/A

Tier 3: Bard, Crusader, Chronomancer, Dragon Fire Adept, Duskblade, Factotum, Fixed-List Caster*, Swordsage, Warblade

Tier 4: Adept, Aristocrat//T5, Barbarian, Hexblade (Bard-Prog-ACF + Jester spells), Ritualist, Rogue, Savant, Scout, Spellthief (w/ Trickster ACF), Warlock

Tier 5: Aristocrat//T6, Battledancer, Dragon Shaman**, Fighter, Gleaner (GitP)], Hexblade, Knight, Magewright, Marshal, Monk, Ninja (CA), Paladin, Ranger (w/o Mystic Ranger ACF), Ritual Warrior, Samurai (CW), Spellthief (w/o Trickster ACF), Swashbuckler

Tier 6: Aristocrat, Commoner, Expert, Sohei, Warrior

*Bard remains unchanged.
Ritualist gets renamed to Arcanist to avoid confusion with the Arhosan ritual magic system.

**Will be adapted to the patron of the party.

Taxation Is Theft
Feat taxes are lame, so everyone gets the following feats for free:

• Combat Expertise
• Improved Shield Bash
• Personal Firearms Proficiency
  
• Precise Shot
• Quick Draw
• Somatic Weaponry
• Two-Weapon Fighting
• Weapon Finesse

Additionally, the following feats are automatically gained on certain tresholds:

• Track - 4 ranks in Survival
• Urban Track - 4 ranks in Gather Information

Changes to Classes

(click to show/hide)

Adept

• Adepts pick either Int or Wis as spellcasting attribute (non-reversible)
• ACF (Level 2): Lose: Familiar. Gain: Add the spells of a Cleric Domain to your known Adept spells. They gain neither the domain power nor domain slots, nor can they trade this feature away for the coresponding Domain Feat.

Aristocrat

• Aristocrats gain new Aristocrat level x 100gp at every time a new Aristocrat level is taken (including 1st level on top of starting money). Their WBL is also increased by the cumulative amount.

(click to show/hide)

Quick cheat-sheet table:
1: 100
2: 300
3: 600
4: 1,000
5: 1,500
6: 2,100
7: 2,800
8: 3,600
9: 4,500
10: 5,500
11: 6,600
12: 7,800

Barbarian

• ACF (lvl 1): Barbarians can trade away Fast Movement for Pounce without needing to be Lion Totem Barbs. This also counts for other classes/ACFs copying Fast Movement (e.g. Druidic Avenger ACF).

Druid

• Fleshrakers have died out a long time ago, and spontaneously combust into unresurrectable ashes if they are brought into the campaign milieu from somewhere else. Just don't.

Gleaner

• Gleaners pick either Cha or Wis as spellcasting attribute (non-reversible)

Monk

• ACF (Level 3): Reduce Speed Bonus by 10ft (down to a minimum of 0ft) and gain Pounce

Paladin

• Paladins can deviate by one category from their default alignment, like Clerics. Violations of their Code of Conduct only matter if they are severe and/or regular enough to move their alignment outside of this space.
• At 4th level Paladins automatically gain Battle Blessing as a bonus feat

Samurai (CW)

• Samurai add Iaijutsu Focus (OA) to their class skills

Scout

• ACF (Level 3): Reduce Fast Movement by 10ft (to a minimum of +0ft) and gain Pounce

Spellthief

• "Trickster"-ACF (Dragon Magazine #353) is explicitely allowed and assumed as standard. Spellthieves rejecting it are reduced to a lower tier (see table)