ProtocolLib 4.7.0
https://www.spigotmc.org/resources/protocollib.1997/

Download the Example resource pack.
Go to: assets\minecraft\models\item\totem_of_undying.json
copy the last line and change the 2 numbers
don't forget to add the "," only the last line doesn't need one.


Go to: assets\minecraft\models\item\custom\materials\totems\
duplicate a file and change its name to the number you added above.
open that file and change the number to that same number


Go to: assets\minecraft\textures\item\materials\totems
add your own texture (64x64px) to this folder and rename it to that same number.

reload your texturepack and run /totemplay <username> <number>