Mist says in the write up that it "Restricts Movement". What does that mean?
I find no definition of "Restricts Movement". what page did i miss it on?
and how does it affect me?
You'll find that Mist reduces visibility to 160 paces, as per Visibility on page 25. Also, under Tactical and March Move Distances on page 29, the second dot point says "No move can exceed maximum unobstructed visibility distance for the time of day and weather".
Put together, this means nothing can move more than 160 paces per march or tactical move.
Yes, the lack of cross-referencing in the rules is a pain in the clacker.