
DropBearHunter |

while I bought some adventure paths on the 1e sale, which will probably supply me with enough material to last till I get a spruce suit.
are there guidelines on how to convert a 2e adventure to 1e rules? for „I‘m too old for a new ruleset“ people like me.
or is it as simple as looking up the monsters by name or CR in the 1e bestuaries?

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You'll need to keep in mind that some design philosophy has changed significantly since 1E, most notably how out of combat healing is handled. Encounter structure has changed significantly as a result. Most 2E monsters have 1E counterparts. NPCs you'll have to rebuild using 1E rules.

Captain Morgan |

The reverse would probably be significantly easier (as most things about GMing are easier in PF2) but if you were going to do it:
PF2 creature level = PF1 CR, NOT HD.
Treasure you should probably just throw out entirely and add it yourself.
Monster Creation: use the Pathfinder Unchained rules
DCs: set them based on your group, I guess?

Ruzza |
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If you were to convert 2e material to 1e, you may still run into the same problem of having to learn 2e just to understand the shift in gameplay and design philosophy. Small things like "adventuring day attrition" that get accounted for in PF1 aren't in PF2, while larger things like the rarity system keeping some of the staple PF1 spells (like teleport, detect alignment, and the like) out of the hands of players would be assumed missing.
I think it can certainly be done, but it would be a difficult process that will require a very decent knowledge of both systems.