To add the ability to change the music, mobs' appearences, and what Special weapons look like in their 3d form with resource editor.
For example, you can edit the Trident's 3D form and special armor like the turtle helmet and the elytra. I also want you to not fill in empty pixels with black when making skins, because the black pretty much hides the detail. You also need to give us the ability to edit the minecraft music (Not the music discs). You arleady know what mean by "editing mobs appearence."