As a Warlock, pledged to Dead Orbit, I achieved a rank of 51 by Sunday. I got all of the ornaments except for the chest piece, which required 34 VIP chests to be collected (3% completion per chest). This seemed above and beyond what any other classes/factions needed for their chest pieces. I was only able to complete 53% (a little under 20 chests collected) in that time. The ornament's requirements only counted the chests collected, not VIP targets killed (like the double servitors on Titan who only unlock a chest, but don't drop one). I feel like this ornament either should have needed fewer VIP chests collected, or should have included Heroic Public Event chests, or other challenging chests. I was able to get all of the other ornaments without much trouble, but this one was just way too much of a grind to achieve in the span of a week.
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That ornament was not hard. All you had to do was go to Titan and kill the captain/knight that spawned in frequently and then go back and forward between the two areas. The hunter chest plate was far harder than anything for the warlock, particularly as you had to have on all dead orbit gear and it had to be multi kills.