Blue carapace, red flesh. Purple carapace, white flesh. Red carapace, bone flesh. There are many, many more, but i would consider these the big three. Unfortunately, their talon/hoof colors, wing membranes (for gargoyles and hive tyrants, etc) or guns don't have any official recommendations.
Just a quick overview of the hive fleet specific rules to help people decide which to field. Wound roll of 6 in fight phase: That attack +1 dmg strategem: Brute force [1 cp] use.
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