"Ñuhys tubissa dāeri issi!"

Translation: My days are free!

[ArminGali]

Isn't it ñuhyZ?

[BrunoSenra]

Because of the "t" that follows it (an unvoiced/voiceless consonant), it uses "-ys" instead.

[BartekMSz]

Thank you! More exceptions than rules so far ;)