REQUIRES FABRIC API
A netherite ingot + any shulker box in the smithing table will produce a netherite shulker box. You do not have to worry about the items in the shulker, these will all be transferred with the upgrade.
What's so special about Netherite Shulkers??
I'm glad you asked! The netherite shulker box item is immune to fire just like your netherite armor and tools. It also has 9 added inventory slots and can not be destroyed by creepers or TNT!
I am currently working on other 'vanilla-like' mods, if you are interested follow me on Twitter for updates!