Finally was able to get a render with the fog. I tried all three suggestions made, but it wouldn't render if I was using the hdri on the background. I had to switch to the environsphere.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10