Basicaly do White Dragons using Snow Vision(Ex), have penalties to perceptions (checks and attacks) inside a Freezing Fog(SP) area?
The Blizzard(Su)ability (...) creates heavy snow conditions (...), so Snow Vision(Ex) sees threw it fully (no concealement for others).
But Freezing Fog (sp): (...) It is similar to an acid fog spell (...), acid fog (...)creates a billowing mass of misty vapors like the solid fog spell (...) spell functions like fog cloud (...) The fog obscures all sight, including darkvision, beyond 5 feet.(...)
They do have Blind Sense(Ex) and Scent(Ex) that basicaly allow to pin-point occupied squares but don't go threw concealement (or total conc.).
I feel Snow Vision(Ex) should see threw Freezing Fog (sp) but would it be too strong and against rules?