This word is just plain fun to say.  It even sounds mysterious, really.  I think it is entirely underused.  I know it is in my own work.

“The den was forfeited to the cabal of teenagers for their D&D afternoon.”

Cabal – noun

1:  the artifices and intrigues of a group of persons secretly united in a plot (as to overturn a government); also :  a group engaged in such artifices and intrigues.

2: club, group.

~per Merriam-Webster