Starfinder 2E GM Core - Chapter 5: Anachronistic Adventures

Source: https://2e.aonsrd.com/rules/1216-chapter-5-anachronistic-adventures

Last Updated: 2026-01-14

Overview

The chapter explores incorporating Pathfinder elements into Starfinder campaigns and vice versa. Both games share compatible rules systems within a science-fantasy setting spanning different timelines.

Core Compatibility Principle

"The rules for Starfinder and Pathfinder are fully compatible." However, certain options require adjustment based on campaign themes and tone. The chapter emphasizes that some Starfinder abilities—particularly darkvision and flight—are more readily available than Pathfinder equivalents.

Rarity Guidelines

Rules elements existing solely in one system should default to uncommon rarity in the other. Items relying on specific ancestries, classes, deities, or equipment are considered rare and require careful GM review for thematic appropriateness.

TIMESHIFTED ADVENTURES

Guidelines for using Pathfinder content within Starfinder campaigns.

Timeshifted Heroes

Both character systems use identical creation processes. GMs determine which abilities fit their campaign's themes.

Ancestry

Pathfinder ancestries exist on Absalom Station and other Pact Worlds locations post-Gap. Special considerations include:

Starfinder ancestry feats modifying movement speeds and senses often activate earlier than Pathfinder equivalents
GMs should compare against the human ancestry baseline
Alternative approach: empower all players by adding darkvision and flight to Pathfinder ancestries rather than restricting Starfinder options

Background

Most Pathfinder backgrounds require minimal updates. Preindustrial skill-focused backgrounds need adjustment, particularly:

Skill feats lacking Starfinder relevance should be replaced
Archaic method characters might gain History Lore proficiency
Consider substituting incompatible skill feats with alternative options from the same skill

Class

Both Pathfinder and Starfinder classes function compatibly. Important considerations:

Multiclass Concerns: Avoid mixing class feats from similar roles between games due to unintended ability stacking.

Technology References: Gear-dependent classes require conversion:

Alchemist bombs → grenades
Inventor innovations → experimental tech armor

Overlapping Niches: Bard/mystic, operative/rogue, and commander/envoy combinations may create redundancy requiring encounter adjustment.

Archetype Conversion: Requires careful analysis of item dependencies and spell interactions.

Deities

Pathfinder deities remain active in Starfinder. Considerations include:

Many deities updated their arsenals to include tech weapons
Characters gain proficiency in either archaic or modern deity favored weapons (not both)
Split-era campaigns may allow proficiency swapping between time periods

Equipment

Archaic items require careful review. Alchemical items, talismans, and runes lack Starfinder equivalents and may necessitate exclusion.

Feats

Skill and general feats transfer readily. Restrictions apply to:

Feats requiring incompatible equipment
Alchemy-dependent abilities (replaced by grenades/pharmaceuticals)
Scroll/wand-focused options (use spell gems/chips instead)
Augmentation/tech feats that may become superfluous

Practical adjustment: Characters gaining access to Computers and Piloting skill feats should receive retraining opportunities.

Skills

Starfinder introduces Computers and Piloting (replacing Driving/Sailing Lore). GMs should:

Allow Piloting skill use for related checks until characters train formally
Substitute incompatible Lore skills with broader alternatives (History Lore, Golarion Lore)
Preview skill usage expectations before campaign start

Spells

Spell volume demonstrates magic's universal efficacy. Cautions include:

Equipment-modifying spells (armor/weapon runes) incompatible with Starfinder gear
Utility abilities (darkvision, flight) may become less attractive due to affordable tech equivalents
Review spells carefully to ensure thematic fit

Starfinder Adventures

Environmental and mechanical differences require narrative management.

Technology

Technological disparities create roleplay opportunities. GMs should:

Describe technology without modern terminology initially
Expect rapid PC acclimation to advanced systems
Avoid prolonged tech-rejection character arcs in long campaigns
Ensure all PCs access equipment others rely upon

Downtime

Post-scarcity civilization offers abundant leisure opportunities. Considerations:

Information discovery is significantly easier via infosphere
Increased surveillance risk for critical failures
PCs may lack knowledge to avoid information security pitfalls

Crafting

Starfinder crafting operates faster than Pathfinder:

Creator capsules enable 3D printing in hours (vs. days)
Fabricator feat streamlines consumable replenishment
Maker's app provides affordable formula access
Serum Crafting replaces alchemical item interest

Skill Checks

Pathfinder characters may lack Computers and Piloting training. GMs should:

Ensure alternative skill solutions exist (Crafting/Thievery for Computers; Perception/Survival for Piloting)
Preview skill availability to encourage timely retraining
Create narrative risk encouraging skill development

ARCHAIC ADVENTURES

Guidelines for using Starfinder content within Pathfinder campaigns.

Archaic Heroes

System compatibility enables Starfinder options in fantasy settings with mechanical adjustments.

Ancestry

Starfinder ancestries lack precedent on ancient Golarion but can appear through:

Interdimensional transportation (aiudara gates)
Ancient civilization returns (Azlanti Star Empire)
Cultural integration over generations

Mechanical adjustments:

Darkvision and special senses availability should be restricted to higher feat levels
Movement speed feats (flight, climbing) should match Pathfinder progression pace

Background

Most Starfinder backgrounds fit with minimal adjustment. Technology-dependent options require replacement:

Appropriate conversions: Diplomat, Smuggler, Dream Prophet
Requires adjustment: Electrician, Hacker, Augmented Body
Remove tech prerequisites: Select alternative skill feats

Class

All Starfinder classes function in Pathfinder campaigns with varying adjustment needs.

Envoys: Excellent support characters; minimal adjustments needed. Hotshot and Infosphere Director leadership styles require vehicle/computer availability.

Mystics: Ideal spontaneous support casters; minimal adjustments. Some campaigns may limit telepathy effects in intrigue scenarios.

Operatives: Consistent ranged damage dealers requiring discussion of gun-equivalent weapons. Recommend allowing Aim with all ranged weapons (not just guns) during transition.

Solarians: Require no adjustments; cosmic channeling fits fantasy themes perfectly.

Soldiers: Require adjustments for area weaponry. Options include:

Scavenged alien weapons
Whirling Swipe feat as sole area attack source
Modified Suppressed condition effects at lower levels

Witchwarpers: Excellent high-mobility casters; minimal adjustments. Paradox skills may require thematic reframing.

Deities

Pre-Gap Starfinder deities remain active on ancient Golarion. Time-traveling followers may:

Lack direct deity connection (unknown patron support)
Receive guidance toward home timeline
Discover patron deity identity later

Equipment

Technology-deprived campaigns require Pathfinder equipment substitutes. Sources include:

Numerian alien technology
Jistka Imperium relics
Alkenstar experimental weapons
Alchemical/magical equivalents

Currency considerations: Tech gear value dramatically exceeds Pathfinder baseline in antiquity settings.

Feats

Most Starfinder skill and general feats transfer directly. Exclusions:

Technology-specific abilities (Augmented Body, tech skill feats)
Comm unit/infosphere dependence (Digital Ambassador, Master Troll)
Piloting feats (require vehicle-heavy campaigns)

Skills

Computers and Piloting lack natural Pathfinder equivalents. Substitutions:

Piloting → Driving Lore, Sailing Lore, Survival
Computers → Crafting, Mathematics Lore, Thievery

Discuss Piloting applicability before campaign commitment.

Spells

Technology-dependent spells require careful management:

Spells requiring tech (Motivating Ringtone) need magical item bridges
Robot references → construct equivalents
Mobility spells (Polymorph, Skyfire Wings) should increase in rank
Virtual reality spells → illusion/dreams/mindscape alternatives

ANACHRONISTIC CREATURES

Pathfinder creatures integrate into Starfinder with minimal adjustment using these guidelines.

Damage Types

Starfinder characters access broader damage type variety. Note parties with limited damage options against creatures with relevant resistances/weaknesses. Fire weakness is particularly common against laser and explosive weapons.

Environment

Environmental considerations:

Space encounters: Creatures require environmental protections or cosmic trait.

Radiation: Creatures need poison resistance or preexisting sickened condition integration.

Starships: Intelligent creatures require useful skills (Computers, Crafting); feral creatures need thematic abilities (compression, garbage attacks).

Adapted creatures: Reference Alien Core for world-specific survival abilities.

Equipment

Upgrades to creature gear enhance encounters:

Apply analog or tech traits to weapons
Provide comm units/datapads to intelligent NPCs
Include ammunition/battery loot for PCs
Consider integrated equipment preventing easy recovery

Movement Speed

Address flying PC advantages by providing:

Grafted wings or integrated jetpacks
Climb speeds or teleportation
Environmental features (wind, platforms, variable gravity)

Ranged Attacks

Most Pathfinder creatures benefit from ranged attack additions. Alternative gap-closing methods include:

Improved Grab
Improved Knockdown
Environmental hazards pulling PCs closer

ANACHRONISTIC GEAR

Guidelines for Pathfinder equipment use in Starfinder campaigns.

Item Grades

Default treatment: Pathfinder equipment receives archaic trait, preventing standard upgrade application.

Conversion options:

Rune preservation: Characters apply runes using ancient techniques
Tech conversion: Spend additional week plus 50% base price to:
- Install upgrade-compatible technology
- Integrate comm units and environmental protection
- Add upgrade slots to shields/weapons
- Apply tech trait and commercial-grade designation

Ammunition

Archaic ammunition remains available throughout Pact Worlds:

Crossbow bolts and arrows used by athletes/hunters
Flintlock ammunition crafted by enthusiasts
Blowgun darts compatible with needler pistols
Low-tech worlds carry better selection

Other Equipment

Starfinder equivalents simplify conversion:

Spell gems ↔ scrolls
Serums ↔ potions
Grenades ↔ alchemical consumables

Caution: Verify converted equipment interactions with feats/items case-by-case.

Optional Rule: Archaic Equipment Degradation

For campaigns emphasizing technology superiority:

Broken Threshold: Archaic equipment gains broken condition at 75% maximum hit points (instead of 50%).

Armor weakness:

Light armor: 6 weakness to non-archaic weapons
Medium armor: 4 weakness to non-archaic weapons
Heavy armor: 2 weakness to non-archaic weapons

Weapon damage: Non-critical hits deal one die size reduction against non-archaic armor (minimum 1d4).

Treasure & Rewards

Ancient magic items function as antique treasures:

Collectible value to museum/private buyers
Infosphere facilitates collector discovery
Consider resale restrictions for certain items
Evaluate alternative story rewards if enabling full-price sales

CURRENCY CONVERSION

Standard rates:

1 credit = 1 silver piece
10 credits = 1 gold piece

Practical application: Antique coins lack commercial acceptance in Pact Worlds. Currency exchange through AbadarCorp and collectors provides conversion.

SPECIAL MECHANICS

Summoning Adjustments

Cautions for planar summoning across systems:

Verify spell and equipment compatibility
Assess creature movement speed appropriateness
Consider designating cross-system summoned creatures as uncommon/rare

Time Travel Narrative Devices

Continuity preservation options:

Gap supernaturally alters sensitive information
Deity/fate intervention limits historical changes
Time travel creates alternate reality (no home timeline impact)
Disbelief prevents information spread

Anachronistic Side Quests

One-shot adventures can transport PCs between eras with loose rule enforcement, resolving incompatibilities upon return. GMs may permit artifact retention as campaign memento.

KEY THEMES

The chapter emphasizes:

Communication: Players appreciate out-of-character rule adjustment explanation
Story integration: Mechanical conversions should reflect narrative reality
Balance flexibility: Guidelines adapt to campaign tone and length
Progressive adaptation: Time-displaced characters gradually acclimate to new setting norms
Encounter design: Account for mechanical disparities when mixing system elements

CROSS-SYSTEM CONVERSION SUMMARY

Pathfinder → Starfinder Adjustments

Character Elements:

Replace archaic skill feats with tech-appropriate alternatives
Substitute Computers/Piloting for Driving/Sailing Lore
Convert alchemist bombs → grenades
Replace scroll/wand feats with spell gem/chip equivalents
Review rune-dependent spells for compatibility

Equipment:

Archaic trait applied by default
Tech conversion available (1 week + 50% base cost)
Currency: 1 gp = 10 credits; 1 sp = 1 credit

Mechanical Balance:

Starfinder provides earlier access to darkvision/flight
Consider empowering Pathfinder ancestries rather than restricting Starfinder options
Address multiclass stacking concerns between similar roles

Starfinder → Pathfinder Adjustments

Character Elements:

Replace tech-dependent skill feats
Substitute Driving/Sailing Lore/Survival for Piloting
Substitute Crafting/Mathematics Lore/Thievery for Computers
Adjust movement/sense feats to match Pathfinder progression
Review tech-dependent spells for magical alternatives

Equipment:

Require narrative sources (Numeria, Jistka, Alkenstar)
Dramatically reduced tech gear value in antiquity
Currency: 1 credit = 1 sp; 10 credits = 1 gp

Class-Specific Adjustments:

Envoys: Minimal changes (verify vehicle/computer availability for some styles)
Mystics: Minimal changes (consider telepathy limitations in intrigue)
Operatives: Allow Aim with all ranged weapons during transition
Solarians: No adjustments needed
Soldiers: Adjust area weapon availability; consider alternatives
Witchwarpers: Minimal changes (reframe paradox skills thematically)

This document contains the complete mechanical details from SF2E GM Core Chapter 5: Anachronistic Adventures, including all conversion rules, currency rates, equipment guidelines, class adjustments, and cross-system compatibility frameworks for integrating Pathfinder 2E and Starfinder 2E content.