Ridiculous OP is ridiculous. Carapace infestation. Tyranid Bioform spread onto the planet via spores that begin as small Tyranid plant like protrusions on the surface of a planet. Unknown to most, it quickly develops a vast root system. In a matter of hours the hive mind directs it into a burst of accelerated growth to sprout chitinous plates up from the earth, burrowing through concrete, stone, and steal to act as defensive structures for the hordes of warrior organisms. The creature is sometimes found developing specialized biomorph symbiotic life forms. A Bioplasmic cannon (Las cannon), a synaptic beacon (comm system), and hard as the toughest armor spikes (tanks traps) being a few examples. There. Nids can use a ADL and it fits the fluff.
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