Purchased the Iron Pledge Ornament (Hunter Helm) from Saladin along with other ornaments and only the Helmet needed to be purchased again but with synthweave although it is in collections so I can just buy it
Edit: same with Gheleon's Iron Grips (Hunter)
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The Iron Banner ornaments offered by Saladin are not universal ornaments. They can only be applied to Iron Banner armor, as they were designed to do back in seasons 1 and 2 of Destiny 2. If you wish to apply those ornaments to non-Iron Banner armor, you will need to convert them into universal ornaments using the armor synthesis feature.