% Inside back cover.
\newpage
\thispagestyle{empty}
\hbox{}

% Back cover page - or it it?
\newpage

% Pad pages to multiple of 4.
\newcounter{frontpages}
\setcounter{frontpages}{3 + \thelastfrontmatterpage}
\padpages{4}{\thefrontpages}

\pagecolor{havocpurple}
\thispagestyle{empty}
\mbox{}