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Acid Blood
From Warhammer 40k - Lexicanum
Acid Blood is a biomorph present in certain Tyranid creatures. It is so corrosive it can eat through flesh and ceramite armour in mere moments.[1]
Literally all of the creature's bodily fluids are acidic, so deep wounds will spew acidic liquids over nearby units.[2]
Sources
- 1: Codex: Tyranids (5th Edition), p. 84
- 2: Codex: Tyranids (2nd Edition), p. 66