The Rhoonoceros of Power

The Rhoonoceros of Power is a rhinoceros god, presumably an Ancient, who guards the Icosahedron of Capacity, much like the Elephoont of the Shapes guards the Octahedron of Transcendence. He resides in the -83.6^π+69.2ă̶̢̬̖̰̘̇̂́̀͂̈a̸̛̗͖͎̠̯͑̈̔͌̈́̀͝a̶̛̻͓̹͂̆̀̽̆a̵̢̺̹̬͈̯̼̳̩̭̰͂̽͜͜027/34^903*51̷̢͕͕̪͇͎̙̯͈̭̼͕̳̅͜1̷̢̧͈̩͓̦̳̲̪͍̮̎1̸͙͕̗͓̘̖̺̉͛̏̽̈́̈́̐̈́̾̔̏̄̕͘̚1̸̲͉͇̿̅̀̕͠1̶̡̡̗͉̯͓̗̘̱͙̞̰̰͌̍̂̑͑̒̐̅̆͌͝1̷̢̢̮̗̣̫̬̱̋1̴̘́̃̿̐̋͂͆̕̚͠48.5st dimension. His existence is highly debatable, much like that of the Icosahedron itself, because he only appeared in one of the (probably) non-canon Riddle of the Rocks sequels by PoseidonHeir.

He appears to be a simple rhinoceros head, although certain parts of him are completely transparent, through which you can see the background.

In PoseidonHeir's "The Icosahedron of Capacity" Meme Man acquired the Icosahedron of Capacity from the Rhoonoceros by telling him the answer to the Riddle of the Rocks.