Posts from How do I create an artifact based on an existing one?
through Artifacts.xdb, and you need to modify it.
Find the desired item there; for the dragon shield, it's DRAGON_SCALE_SHIELD. To change the name, you need to modify the NameFileRef and DescriptionFileRef lines to your own, or change the entries in the existing files for that artifact. Yes, this will affect all maps, but there's no other way to do it.
Here's what will affect all maps, and that's a problem; I wouldn't want to corrupt the game files. However, the question is this: if you open data.pak with WinRAR, you won't be able to edit the internal files (you can't open them with Notepad, and the Internal Viewer doesn't allow editing). How can you change them in that case?
If you are going to make modifications specifically in your data, then this modification will not be in the map.
I don't understand why you can't edit the xdb files with Notepad...
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