Warns if you don't have a Unity legendary equipped. Set up to warn if you don't have a specific legendary equipped for a specific class+spec.
For example, I have it set up to warn if I don't have "Invoker's Delight" legendary equipped as WW Monk, and then also to warn if I don't have "Stormstout's Last Keg" legendary equipped as Brewmaster.
To set this up for your class/spec legendaries, follow the steps below and refer to screenshots.
Note: Make sure you press Enter/Return after you type in a new number (below).
1. Open /wa and find the Legendary Audit group. Expand it.
2. Right-click on one of the Monk legendary WeakAuras, and select "Duplicate"
3. Rename the duplicate you created to something that makes sense to your class/spec.
4. Using the duplicate you just created, go to its "Load" settings tab at the top
4A. (Pictured) In "Load" settings, change the "Class and Specialization" load settings to what makes sense for the class/spec of the legendary you want to track. Note, you can use different or additional load settings as well, for example being a specific Covenant, having specific items equipped, etc.
4B. (Pictured) In "Load" settings, at the bottom, change the number entry for "Not Item Bonus Id Equipped" to the Bonus ID for the Legendary that you want to ensure is equipped. To find this Bonus ID, hover over the text box where you type the number, and you'll see a list of available Bonus IDs for your current spec. To see a full list, find the legendary in this table, and use the "ItemBonusListID" column -- https://wow.tools/dbc/?dbc=runeforgelegendaryability&build=9.2.5.44325#page=1
5. (Pictured) In the "Trigger" tab, change the "Item Bonus Id" to the same number you located in 4B.
6. (Pictured) In "Display" settings, change the "Fallback Icon" to one that matches your legendary. Click the Folder icon to the right of the number, and search for your legendary power by name.