GuestTheDev

The resource pack adds items from new versions! Work on servers. Adds items, mobs, blocks. You need versions 1.12.2 or 1.8.9 (OPTIFINE!)

1 use case: Fake replacements, as if you logged into the server from an old version using Viaversion. 2 use case: Making support for older resourse packs (only textures). Thats a Resource pack.