It seems that the Comitatus is impossible to get. I never complain about RnG but damn, this thing has been evading me. I have all 3 characters on New Monarchy right now and haven't had it drop. Seems like it's been an issue for a lot of people. Bug maybe?
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Good to see more people talking about this. Como addressed the issue and bungie is looking into it. Should see a patch in the future.