Poorly Timed Shield

Trigger a worm attack on a square of your choice.
In Dune, Hawat, a member of the House Atreides,
claimed , "a body-size shield will call every worm for hundreds of meters around. It appears to drive them
into a killing frenzy" (Herbert, 142). Sandworms
could be hundreds of meters long, tens of meters in diameter, and would not hesitate to obliterate
anything in their path. Agitating one using a shield
was a death sentence.