I will discuss a few reasons to go beyond minimal dark matter models,
and some theoretical ideas that motivate us to consider a QCD-like
dark sector. One characteristic signature of such dark sectors are
"emerging jets" that can be reconstructed in the calorimeter but leave
few hits in the inner trackers. We propose a new strategy to search
for these emerging jets, using their "trackless" feature to
discriminate from QCD background. Compared to ordinary multi-jet
resonance searches, the sensitivity can be increased by four orders of
magnitude or more.