documentclass[12pt,a4paper]{scrartcl}
usepackage[ngerman]{babel}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}
usepackage[paper=a4paper,left=25mm,right=25mm,top=25mm,bottom=17mm]{geometry}
usepackage{graphicx}
usepackage[automark]{scrlayer-scrpage}
usepackage[german=guillemets]{csquotes}
usepackage{minitoc}
usepackage{mwe}
usepackage{tocloft}
newcommand{ignore}[1]{}
renewcommand{cftpartleader}{cftdotfill{cftdotsep}}
renewcommand{cftsecleader}{cftdotfill{cftdotsep}}
chead{- thepage hspace{1pt} - }
cfoot{}
letraggedpartcentering
makeatletter
@addtoreset{section}{part}
makeatother
renewcommand*{partformat}{thepart}
newcommand*{extendedpart}[5]{
begin{titlepage}
begin{large}
    centering
    #1par
    addpart{#2}refstepcounter{part}
    vfill
    #3par
    vfill
    #4par
    vfill
    textbf{Autor:} #5par
  end{large}
  end{titlepage}
  parttoc
}
usepackage{hyperref}
renewcommand*{theHsection}{thepart.thesection}
mtcsettitle{parttoc}{Inhaltsverzeichnis}

begin{document}

begin{titlepage}
begin{large}
centering
Some informationpar
part*{Title}
vfill
Description par
vfill
includegraphics[width=.7textwidth]{picture.jpg}par
vfill
begin{center} textbf{Author:} ... end{center}
end{large}
end{titlepage}

setcounter{tocdepth}{3}
tocloftpagestyle{empty}
doparttoc
tableofcontents
clearpage

addpart{Introduction}
blindtext

extendedpart{Some information2}{Title2}{Description2}{includegraphics[width=.5textwidth]{picture2.jpg}}{Author2}
include{story1}

%and the other nine stories

end{document}

section{Title 1}
Some text here.
section{Title 2}
Some other text here.