The Origins of Yifrin

The language in the book Stormride, Praseo is a sister of Yifrin and that it's derived from common Yifrin. There are abundant tildas in the grammar. I actually toned it down a little because my early versions of the rules was just nasalizing everything. The name of the people are the Prasei, which does have a nasal vowel on the second syllable. Do I hear a nasal vowel in the Praseo? I think I do.