Ravener

Raveners move 9" on the Movement phase and can make an Assault move up to 9". When rolling for distance moved through difficult terrain add +1 to the highest roll. Roll 3D6 for fall back and pursuit distances.

If the Tyranid player gets to choose the scenario then the Tyranids will automatically be the attackers and must choose a scenario from the category of Battle.
All three missions under Battle use the Deep Strike rule, and all models in the Tyranid Seeding Swarm must arrive on the table by this method. The exception are Tyranid broods with the infiltrate rule and Lictors.
For all other scenarios, if the Deep Strike option exists it can only be used by Tyranid units with the Deep Strike rule.