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Package typearea Warning: Maybe no optimal type area settings!
(typearea)                The maximum limit of line width is about 18%
(typearea)                larger than the heuristically detected line width.
(typearea)                You may e.g. increase DIV, decrease fontsize
(typearea)                or change the papersize.

\documentclass[a5paper]{scrartcl}

\usepackage{xltxtra}
\defaultfontfeatures{Mapping=tex-text}
\usepackage{polyglossia}
\setdefaultlanguage[spelling=new]{german}

\usepackage{multicol}

\usepackage{blindtext}

\begin{document}
\begin{multicols}{2}
    \Blindtext
\end{multicols}
\end{document}

\documentclass[a5paper,DIV=calc]{scrartcl}