Dune
Where does Shai-Hulud appear, and what does it devour?
It appears in the territory shown on the top card of the discard pile it was drawn for. Every bit of spice and every force in that whole territory goes to the bank and the Tleilaxu Tanks, whatever sector it is in and even if the storm covers part of it. Fremen forces are spared. The Polar Sink is not sand, so a worm cannot appear there.