@A-Tan An interference unit variety, the bottom with a mission carrying the stuff that will eventually be in Lyza grave, if alive at the bottom. What on earth are this questions on a layer that is not the bottom? Is like asking on the fourth layer arc who are the umbra hands as that questions belongs to their respective arc. Instead it answered us things like value, what is and how it works, an element that we have seen with Garburune could expand beyond that layer and is very connected on how some relics lead to the potential of wishes, dreams and who we are and how that is valuable and the bases to eventually know what is the relics true purpose as we now know some respond to human wishes. Is most likely one as there wasn't just one civilization buried, there are civilizations as old as 6000 year buried, but they come from the same line so it was answered who are some of those skeletons and why they were there as they are culture praising the Abyss. talking about years, we finally have data on the time dilation as 2000 years more or less when the Ganja arrives is equavelent to the 150 years that have passed down there. lets see, we know there are relics like riko original compass that were created to let others to the Abyss, talking about Interferance units before, we know the ones down there have interests and creatures and humans since they were created to study, analize and even adapt quickly to their languages. Oh language, how to forget how we know were the Abyssal language come from as it is based from relics and the old culture, and that old culture based their language on the golden citizens aka the ones down there. The questions created in this arc were also answered as what is Faputa, how does their economy work, why did Belafu was like that across the arc, what is Belafu plan (that could even affect the future of the story), why are the Narehates stuck in there, as I mentioned before what are the bases of Iru culture, how was Orth created when another culture was still there as Ganja weren't even the first to reach the Abyss that lead to Orth. So no answers you say even if as in every other arc there wasn't the need to answer stuff that belongs to their respective layer as it is then answered as we have seen. Lets not even talk about questions, Nanachi finally has moved on enough to stop being a suicidal bunny just on the journey to die, Reg has been awakened and the retun of his memories has start, Riko has started to define what she truly wants to do, how to act and what are her priorities as the journey goes on, and as much as you dislike Prushka denying she has been and introduced and has evolved as much as the main characters. So I honestly recommend a re-read instead of saying it hasn't answered practically nothing