  We systematically explore the phenomenology of the recently proposed extended
dark matter effective field theory (\eDMEFT), which allows for a consistent
effective description of DM scenarios across different energy scales. The
framework remains applicable at collider energies and is capable of reproducing
the correct relic abundance by including a dynamical mediator particle to the
dark sector, while maintaining correlations dictated by gauge invariance in a
`model-independent' way. Taking into account present and future constraints
from direct- and indirect-detection experiments, from collider searches for
missing energy and for scalar resonances in vector-boson, di-jet, and
Higgs-pair final states, as well as from the relic abundance as measured by
Planck, we determine viable regions in the parameter space, both for scalar and
pseudoscalar mediator. In particular, we point out regions where cancellations
in the direct-detection cross section appear leading to allowed islands for
scalar mediators that could be missed in a naive simplified-model approach, but
are present in the full $D=5$ effective theory, as well as a general opening of
the parameter space due to consistently considering all operators at a given
mass dimension. Thus, canonical WIMP-like scenarios can survive even the next
generation of direct-detection experiments in different mass regimes, while
potentially becoming testable at the high-luminosity LHC.
