Quote Originally Posted by RedFox View Post
Neuter gender.
Well... I don't remember formal grammar rules, so have no idea what declension type it is.

I guess, animate nouns should, as usual, use genitive as accusative plural, but I can't recall any animate -ё noun to prove that. Maybe, there is no one such noun.
The fact that most of the -ё nouns just has no plural forms:

Usual nouns; plural forms exist: остриё - острия, ружьё - ружья, цевьё - цевья, копьё - копья...
Collective nouns, no plural: бабьё, дубьё, зверьё, мужичьё, дурачьё, вороньё, комарьё, бельё, жильё, старьё, сырьё...
Verbal nouns, no plural: мытьё, нытьё, житьё, питьё, шитьё, быльё...
I think I've figured out the declension type using Wikipedia. In this link and section, it mentions -yo as an exception in the nominative form, under exception rule number 2: Russian grammar - Wikipedia, the free encyclopedia

So I think -yo is of the second declension type in neuter gender. I also think that due to this, for -yo, that N or G also applies for it in the accusative plural form.

I will edit my table accordingly and if anyone can confirm this, then that would be great.