Shouldn't "dovaogēdi" be on it's accusative form? Shouln't it be "dovaogēdī"?
This sentence is talking about a single Unsullied, so it uses the singular accusative, which for the 2nd declension class ends in -i. For nouns that end in -y, this is the same as the plural nominative.
See more at this link: https://wiki.dothraki.org/High_Valyrian_Noun_Declensions#Lunar-type:_tr.C4.93sy