Are any of you using 'Success at a Cost' (DMG 242) and could you see the following action resolution handling occur in your game?
Situation: The PCs pass through a Fey Crossroads into the Feywild and must find their way from their unknown point in an enchanted frozen forest of perpetual night to the Dawnmote (lets say its a Winter Fey guarded oasis in this place that doubles as a means to travel to the Summer Fey's domain).
To your South and West, a stand of trees rise to extraordinary heights before the darkness cuts off what lies atop them. The trees sway rhythmically with unseen wind (or something else). To your North and East, a precarious field of ice stretches out before you in all directions, eerily cracking and groaning. There is no breeze. There is nothing.
Let us say the Survival Proficient Fighter figures that maybe the heat of the Dawnmote is creating a pressure gradient which generates the unseen wind upon the stand of trees.
Wisdom (Survival) check of 18 vs DC 20.
GM (success but an obstacle that changes the nature of the situation): "It almost must be so. In the moments you think on this and get your bearings, the groaning ice fractures, sending cracking tendrils this way and that. Its coming apart beneath your feet...and by torchlight, you can see something...moving...beneath the ice...
What do you do?!
Questions: