These beasties provide the 'Shrouded' rule to all friendly units within 6" by nature of gas filled bladders which emit a dense, malodorous fog. "Brief exposure causes violent bouts of nausea and uncontrollable muscle spasms", according to the rulebook. So basically, you can improve your Tyranids' chances of survival by farting on them. But you'd better hide the creature in a bastion or something, otherwise your opponent will vapourise it in the first salvo.
|Silent But Deadly|
|Sitting in a puddle of his own filth. Nice.|
|The Red Terror!|