What's the plural form of protoscripture? Here's the word you're looking for.
Answer
The noun protoscripture can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be protoscripture.
However, in more specific contexts, the plural form can also be protoscriptures e.g. in reference to various types of protoscriptures
or a collection of protoscriptures.