Welcome to The Dark City constantinou!
With both the Duke and Lilith you are spending a lot of points in your HQ slot (over 20% of your army). That's a lot of point for two vulnerable T3 models. Take one or the other, not both.
You don't have much anti tank in the army so mech armies might give your list trouble.
Finally the reaver units are small, expensive and are easy victory points in purge the alien and the scouring. I would drop the caltrops and merge them into one unit.
Hope that helps.
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