1. We don't need another column because the limited faction stats should already be clear: "Additionally they provide an extra property, which is only granted to a hero of the correct faction. These properties are marked with the respective faction icon.".
2. Sortable columns for the names are a good idea. For the stats it's pointless because the function can't distinguish the values. It is only sorted by numbers, which makes no sense.
I add the sorting by stats because i find the sort my name useless, and seeing the artifacts as groups of anti-class and general or sort by faction like there used to be are easier to find the artifact you are looking for, because most if the time you are searching for an artifact based on stats and not based on the name, also you can you the search function on every browser today.
So I add sorting by what ever you like to save you the trouble of sorting them every time will keeping the sort by stats and faction that I like, so having all of them won't hurt anyone.
I pre-sorted the exclusive artifactes by faction now (as it was before). Sorting it by stats makes no sence. For example: If you want to sort the orange exclusive artifactes by HP... it's impossible, since the sort function always uses the numeric values (of the first line) by default. It's a problem of the format. You will (nearly) never get a helpful result.
I've deleted the unused filed that you mentioned, and I'd like to invite you to my/our Discord room, where we have a seperate channel for wiki editing and it's easier like that. There are other cool people and of course other wiki editors there! Come join us :) click here: discord.gg/5bsqSmA