"Voktys zaldrīzī belmurza."

Translation: The priest is chaining the dragon.

[SimnNahuel]

What is the difference between belmurza and belmurzi? Is it singular/plural depending on the subject (Voktys) or the object (zaldrizi)?
Kirinvose!

[Graerys]

I think, though I stand to be corrected on this, that the long 'i' makes Dragons a plural anyway. But the answer to your question AFAIU is that belmurza refers to the subject, and so is singular. So:
Voktys zaldrīzī belmurza, the priest is chaning the dragons;
Voktyssy zaldrīzī belmurzi, the priests are chaining the dragons.