Drop rates for going from nothing to a basic pass aren't in the same place, so it's likely that they didn't change basic pass drop rates from the normal dungeons. You can always buy a guaranteed basic pass from the Poulnabrone dude anyways.
- Alby Basic
- 20%: Alby Basic Fomor Pass
- 60%: Alby Intermediate Fomor Pass
- Alby Intermediate
- 10%: Alby Intermediate Fomor Pass
- 40%: Alby Advanced Fomor Pass
- Alby Advanced
- 6%: Alby Advanced Fomor Pass
- 20%: Mangled Alby Dungeon Pass
- Alby Advanced Hardmode
- 10%: Mangled Rabbie Dungeon Pass
- Ciar Basic
- 20%: Ciar Basic Fomor Pass
- 60%: Ciar Intermediate Fomor Pass
- Ciar Intermediate
- 10%: Ciar Intermediate Fomor Pass
- 40%: Ciar Advanced Fomor Pass
- Ciar Advanced
- 6%: Ciar Advanced Fomor Pass
- 20%: Mangled Ciar Dungeon Pass
- Ciar Advanced Hardmode
- 10%: Mangled Rabbie Dungeon Pass
- Math Basic
- 20%: Math Basic Fomor Pass
- 40%: Math Advanced Fomor Pass
TrigonometryMath Advanced- 6%: Math Advanced Fomor Pass
- Rabbie Basic
- 20%: Rabbie Basic Fomor Pass
- 40%: Rabbie Advanced Fomor Pass
- Rabbie Advanced
- 6%: Rabbie Advanced Fomor Pass
- 10%: Mangled Rabbie Dungeon Pass
- Barri Basic
- 20%: Barri Basic Fomor Pass
- 40%: Barri Advanced Fomor Pass
- Barri Advanced
- 6%: Barri Advanced Fomor Pass
- Coill Basic
- 20%: Coill Basic Fomor Pass
- 60%: Coill Intermediate Fomor Pass
- Coill Intermediate
- 6%: Coill Intermediate Fomor Pass
- Fiodh Intermediate
- 10%: Fiodh Intermediate Fomor Pass
- 40%: Fiodh Advanced Fomor Pass
- Fiodh Advanced
- 6%: Fiodh Advanced Fomor Pass
- Rundal Basic
- 20%: Rundal Basic Fomor Pass
- 40%: Rundal Advanced Fomor Pass
- Rundal Advanced
- 6%: Rundal Advanced Fomor Pass
- 20%: Mangled Rundal Dungeon Pass
- Rundal Advanced Hardmode
- 10%: Mangled Rabbie Dungeon Pass
- Peaca Basic
- 20%: Peaca Basic Fomor Pass
- 60%: Peaca Intermediate Fomor Pass
- Peaca Intermediate
- 10%: Peaca Intermediate Fomor Pass