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