Drager wrote:If a Dark Reapers unit eliminates the Ravener unit that emerges before the rest of a Jormungandr force does (and those raveners are the only tunnelers in the army) does the rest of the force die?
Edit: Do you mean using the Stratagem "The Enemy Below"? If so, then you don't have a chance to kill the Ravener before he gets a chance to deploy the other unit set up with them.
If you mean if he deploys all his Raveners, Mawlocs, Trygon or a Trygon Prime without setting up the unit he placed in the tunnels with the stratagem does the unit die, it will die at the end of the 3rd turn because it doesn't have a way to arrive as reinforcements.
Edit: I see, Forwarned is the name of an Acopywritei stratagem. In any case, sequencing will come into play because you now have 3 things happening at the same time, so since it will presumably be the Tyranid players turn (since that's the only time a Ravener can come up in the movement phase to deploy), they get to pick the order things happen, so the answer is still no.