"MU Hobby" refers to a specific community or server iteration where these custom sets are popularized. Unlike the official Webzen servers, private "hobby" servers often use to distribute custom skins and items to their player base.
and similar communities often provide Item Guides for standard wing tiers (Level 1 to 4), but legendary sets like this are often custom additions to specific server seasons. mu hobby dl wings legendary set.ZIP
If you are trying to implement or learn about managing these types of server files, these resources can be helpful: "MU Hobby" refers to a specific community or