The Renioverse (alternatively Iczetaverse) is a huge complex of various Aarexverses. The Aarexverses within the Renioverse have less connections and are further away than Linoverses in the Kudoverse and Intraverses in the Linoverse, which is why -verses leveled in-between the Renioverse and The Box slightly lose significant meanings.
Trirenioverse[]
Trirenioverse is a verse with three Renioverses fusing, only 2 have ever been spotted, we haven't seen any Birenioverses.
Umtaverse[]
An Umtaverse is a Renioverse with 1 Renioverse in it, as multiple (even 2) would be a Lastverse.