  We find that it is possible to increase sensitivity to low energy physics in
a third or fourth DUNE-like module with careful controls over radiopurity and
some modifications to a detector similar to the DUNE Far Detector design. In
particular, sensitivity to supernova and solar neutrinos can be enhanced with
improved MeV-scale reach. A neutrinoless double beta decay search with
$^{136}$Xe loading appears feasible. Furthermore, sensitivity to
Weakly-Interacting Massive Particle (WIMP) Dark Matter (DM) becomes competitive
with the planned world program in such a detector, offering a unique seasonal
variation detection that is characteristic for the nature of WIMPs.
