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Previous Edition Warning: This article discusses a topic from a previous edition of Warhammer 40,000.
Its canonicity is in question but was once considered canon.

Thornback is a Tyranid Biomorph.

In 4th Edition Thornback is a nickname given by Imperial Guard soldiers to Tyranids with large blade protrusions from their carapace. They are often seen charging into ranks of soldiers using pure body mass as their primary weapon and simply impaling any enemies they come across.[1][2]