The ultimate hectoicosikaipentahedron is a verse. It used to follow the same rules as the dohdehcahhehdrohn and was called the ultimate hehctohihcohsihkahihpehntahhehdrohn, but that was a little bit too ridiculous, so it was changed.
Who rules this thing?
The great 125-hedron is ruled by nobody. Nobody owns this.
What are the rules?
Why does this exist?
Because it does.
is hectoicosikaipentahedron a real word?
Yes. It means 125 sided polyhedron.