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I will be GMing deathwatch for me and a group of friends and I have drawn up a few missions already complete with many a custom critter to come devour them. However I am left wanting by the adversaries in the core rulebook.

Is there a book of adversaries I am unaware of or must I create my own rules for every biomass in the galaxy?

You're looking for this. It's not out quite yet - another month or so - but it is sure to be chock full of all sorts of xenos-goodness for your players to squish.