Rules for obscured vision?

[p_Clapham]

So I can't find any rules in Legend, MRQ II, or even Runequest 6 on obscured vision penalties due to darkness or fog. I'm working on a Raise Fog spell for my Wheel of Time spell list, I'd appreciate it if anyone could point me in the right direction.

 

[Captain Brann]

So I can't find any rules in Legend, MRQ II, or even Runequest 6 on obscured vision penalties due to darkness or fog. I'm working on a Raise Fog spell for my Wheel of Time spell list, I'd appreciate it if anyone could point me in the right direction.

I would think that you would use the level of obscuring you want as a % penalty to perception. If you can see the target you can hit it normally.
That is how I would do it.

Moon light night -20%
Moonless night -60%
So a light mist -20% over 50yd's
Fog -60% at any distance
for instance

 

[Carew]

So I can't find any rules in Legend, MRQ II, or even Runequest 6 on obscured vision penalties due to darkness or fog. I'm working on a Raise Fog spell for my Wheel of Time spell list, I'd appreciate it if anyone could point me in the right direction.

Runequest 6. Page 128.

 

[p_Clapham]

Thank you.

So I can't find any rules in Legend, MRQ II, or even Runequest 6 on obscured vision penalties due to darkness or fog. I'm working on a Raise Fog spell for my Wheel of Time spell list, I'd appreciate it if anyone could point me in the right direction.

Runequest 6. Page 128.

 

[Olaus Petrus]

Here are combat penalties from Legend

Close combat (page 135)
Fighting in partial darkness –20%
Fighting in darkness –40%
Fighting while blind or in pitch black –60%

Ranged attack (page 141)
Target obscured by smoke, mist or is in partial darkness –20%
Target obscured by thick smoke, fog or is in darkness –40%
[...]
Target is completely obscured Automatic Failure
[...]
Attacker is blinded Automatic failure

Legend doesn't give fixed penalties to other skill checks, although it does say that you should modify the test accordingly in page 39, for example you should get bonus for hiding in the dark. I think that those same modifiers which the combat tests have can be applied to many other skills as well.

 

[Prime_Evil]

I'd agree with that approach. If you are looking for some OGC rules, there's some treatment of Light Sources and Obscured Vision in OpenQuest and the Rennaisance SRD.