Psionics are semi-transparent to magic. This means that psionics and regular magic intermingles, but some effects or immunities may have a different outcome depending on the power source.
A rule of thumb is "treat as if magic with +10 DC" and vice versa for psionics.
- Power resistance works against magic, but is reduced by 10 (so PR 17 becomes SR 7)
- Spell resistance works against psionics, but is reduced by 10 (so SR 17 becomes PR 7)
- Dispel magic takes a -10 penalty to its rolls against psionic effects.
- Dispel psionics takes a -10 penalty to its rolls against magic effects.
- Anti-magic fields/dead magic zones have a 50% chance of affecting a psionic items or effect.
- Null psionic fields have a 50% chance of affecting a magical item or effect.
- Detect magic does not detect psionics.
- Detect psionics does not detect magic.
Magic immunity and psionic immunity still leaves small vulnerabilities for the other type. Thus a creature immune to magic may still be slightly susceptible to psionics and vice versa.
- Magic immunity means a Power Resistance of CR + 31
- Psionic immunity means a Spell Resistance of CR + 31
Not that some creatures may have magic and psionic immunity.
Psicraft and Spellcraft can be interchanged, but with a -10 when used for the other field. While they intermingle, the power source of each field is alien enough that it can be hard to interpret without proper focus.