Treachery Card Auction, 3. Revival and Movement, 5. Each turn it moves a random amount of 1-6 sectors. In step 3, cards are drawn to determine the location of new spice or the appearance of worms which destroy everything at a previous spice location. All spice locations are not protected from the storm.
Worms also allow alliance rules to come into effect.
During Revival and Movement, players take their move in counter-clockwise. The starting player is determined by the position of the storm. Then, he lands new troops on the board. After that, he makes just one on-planet move. During combat, players who ended up in the same territory fight it out.