A lot of the newer champions and skins require multiple materials. An indicator for that are assets, that are not always there, but for example only appear in the recall animation, like KDA Ahri’s throne. Those champions and skins also usually have more than just the basic texture in the folder Skins/base.
If you encounter any issues with this tutorial or you don’t understand part of it, you can ask for help on the Killerskins-Discord server
or you can contact me directly: IM#6715
While assigning materials you might run into a rare issue, which for example Kalista and Mordekaiser have: they have bones and materials that have the same name.