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my party is currently making their way through the Hells Rebels PF1e adventure that im converting to PF2e. We have had talks about what to do next and i really wanna run Fly Free or Die.
I was wondering if theres any good sources for converting SF1e to SF2e?
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As someone currently converting Signals of Screams, here some of my guidelines:
Encounter Difficulty
SF1 and SF2 are different enough, that the encounters become less severe. Most moderate CR SF1 encounters become low level SF2 encounters, if you just replace the monsters with the same of the Alien Core. If you make all elite monster (and therefore raising the level by 1), the encounter should be around the same difficulty according to GM Core. Except low levels, that is.
Treasure
Starfinder 1st edition has a vastly different economy, as much of the equipment cost more than in 2e (while some items cost the same) and items are sold by only 10% of their market value instead of half their value.
So pure credit rewards are usually worth more. On the other hand, looting too strong loot from NPCs can also unbalance that. As I convert, I have the freedom to adjust here and there and just use the treasure by level table as a guideline.
If you like to do something on the fly, don't have NPC use upgraded weapons, cut a lot of the excess stuff you won't find in the current rulebooks, and adjust direct credit and UPB rewards while not really counting in the NPC loot.
DCs
SF1 uses 15 + character level x 1.5 (rounded down) as the base line for a moderate DC. Therefore whenever a DC is mentioned, it's rather save to check the old DC, use the prior formular to see how much it differs from the base line for the level and use the difference to adjust the SF2 DC by level (*GM core* 53).
Example If a DC 27 pops up at the level 7 part of an adventure, first calculate 15 + 7 x 1.5 (rounded down). That's 25, and the 27 is 2 points higher. DC by level is 23. So bump the 23 to 25 in that case.
I wouldn't recommend to use it all the time, as there are also Simple DCs that sometimes represent the better option (especially if the old DC is also at exactly 10, 15, 20, 30, or 40), but whenever I forgot to mention a DC or you find yourself in a situation where you need to invent stuff on the fly, you can use that approach and usually get it close enough to right.
Skills
Skills are especially challenging to convert, as SF1 and SF2 use different skill lists and not all skills have a direct transition. It also assumes that some different skills are used usually.
Use this list for quick conversions. Whenever a skill that is not profession is replaced by a lore skill, lower the DC by at least 2.
I often listed several skills whenever there is no direct counterpart. Try to allow all the different options. SF2 in general is more open about skill usage than SF2.
There is a special case of Life Science and Physical science, that has been mainly relegated to Lores that many characters won't have. Either make sure that you tell your players that these two will be useful to have in old adventures or use Nature (and Medicine in case of Life Science) as substitutes and lower the DC for the Lores instead.
SF1 | SF2 | Note
--- | --- | ---
Acrobatics | Acrobatics |
Athletics | Athletics |
Bluff | Deception |
Computers | Computers |
Culture | Society |
Diplomacy | Diplomacy |
Disguise | Deception |
Engineering | Crafting, Thievery | Thievery for disarming traps, countermeasures, opening locked doors, and the like
Intimidate | Intimidation |
Life Science | Cooking Lore, Life Science Lore, Medicine, Nature | Cooking Lore to create foods, Medicine for drugs and poisons, Nature for bio organisms
Medicine | Medicine |
Mysticism | Arcana, Nature, Religion, Occultism | Depending on magic tradition
Perception | Perception | It's not a skill anymore
Piloting | Piloting
Physical Science | Nature, Physical Science Lore | There are also several Lores that represent one Science, like chemistry
Profession | Performance, Several Lores |
Sense Motive | Perception | Sense Motive is a Perception Activity now
Sleight of Hand | Thievery |
Stealth | Stealth |
Survival | Survival |
I hope this helps.
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Rotfell's advice is pretty great.
The one thing I'll add is don't forget you can steal stuff from PF2 when needed! I'm trying to convert Dawn of Flame to 2e and there's a lot of elementals there and only a handful of elementals in Starfinder 2e at present. But there's a whole bunch of fire elementals in PF2 that I can draw on.