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Arch Contaminator allows you to reroll all wounds with plague weapons; but I see people highlighting using it with Entrophy Cannons on Plagueburst Crawlers. Reading the data sheet, however, shows that Entropy Cannons are not plague weapons. What am I missing that allows rerolling these wounds like everyone loves to point out, or are they using it exclusively to reroll mortar wounds?

It would only work on the Plague Mortar and Plaguespitters, not the Entropy Cannon.

 Zid wrote:
Arch Contaminator allows you to reroll all wounds with plague weapons; but I see people highlighting using it with Entrophy Cannons on Plagueburst Crawlers. Reading the data sheet, however, shows that Entropy Cannons are not plague weapons. What am I missing that allows rerolling these wounds like everyone loves to point out, or are they using it exclusively to reroll mortar wounds?

You are correct, they are not Plauge Weapons. It only works with the mortar or Plaugesplitter.