Here's something I was thinking about the other day while reading up on the 'Nids: they co-opt the biological potential of the planet, almost from the get-go, so that even "normal" plants and stuff are a potential danger. I thought up the following special rule:
[b]Tyranoforming:[b]
When Tyranids lay seige to a planet, they start at a cellular level, infecting local fauna and floral with viruses, spores, and fungus, altering the very nature of a planet's ecosystem. Once serene woodlands become the home of twisted parodies of the original denizens. Roots and vines take on lives of their own, grasping and clinging to non-Tyranid creatures, animals are driven into a frenzy as their bodies are altered, and strange new creatures appear.
To represent this menace, all "organic" terrain on the battlefield (namely: Jungle, Marsh, Scrub, and Woods) counts as dangerous terrain for all non-Tyranid units. The terrain still grants cover, and the appropriate cover saves, and can be moved through carefully as well. Casualties lost to Tyranoformed terrain do not cause blast markers.
Thoughts?
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) or nidiforming.