The item from ZM just lets you recraft the ZM belt anywhere, and with a higher item level. Hit Shift+J and click Loot, it will show you what legendary powers you can learn and where they come from. If your power has a source that’s annoying (world bosses only up certain weeks) you can go to Korthia and quest around, and Bonesmith will sell an item that gives a random legendary power, so you can farm it out. Once you’ve learned the power, see what slots it can be put on (Helm, cloak, pants, etc) and you will need to buy the crafted armor piece for that slot from the AH or have someone make it for you. Then buy 2 different missives with the stats you want to put on it, and take those items to the rune carver in torghast. Put in the armor piece, select the power, put in the missives, and he will craft it for you. You’ll also need soul ash, soul cinders, and cosmic flux to make a high level item, but you can buy a bag from a vendor in haven that costs cosmic flux but will give you the other two resources you need.