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Rust Decapod
From Warhammer 40k - Lexicanum
The Rust Decapods are fist-sized parasites, that feed on metal, originally from Samech but spread around throughout the Acheros Salient. They eat in swarms and are impervious to heat, and are capable of breaching the critical points in the planet crust, forming eruptions of of molten minerals, that then are cooled into ore are devoured.[1a]
They look like spindly, mud-coloured crabs with six legs and two pairs of pincers like miniature decapitators.[1b] They secrete a powerful organic acid that dissolves metal, from their chelae. They are aggressive and mindless and have a small unnatural warp presence.[1c]
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