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We propose a new method to hunt for dark matter using dark forest/absorptionfeatures across the whole electromagnetic spectrum from radio to gamma rays,especially in the bands where there is a desert i.e. regions where no stronglines from baryons are expected. Such novel signatures can arise for darkmatter models with a composite nature and internal electromagnetic transitions.The photons from a background source can interact with the dark matterresulting in an absorption signal in the source spectrum. In the case of acompact source, such as a quasar, such interactions in the dark matter haloscan produce a series of closely spaced absorption lines, which we call the darkforest. We show that the dark forest feature is a sensitive probe of the darkmatter self-interactions and the halo mass function, especially at the low massend. There is a large volume of parameter space where dark forest is moresensitive compared to the best current and proposed direct detectionexperiments. Moreover, the absorption of CMB photons by dark matter gives riseto a global absorption signal in the CMB spectrum. For dark matter transitionenergies in the range $2.5\times 10^{-4}$ eV$-$ $5\times 10^{3}$ eV, suchabsorption features result in spectral distortions of the CMB in the COBE/FIRASband of 60-600 GHz. If the dark matter transition frequency is $\sim$156 GHz,we show that the absorption of CMB photons by dark matter can provide anexplanation for the anomalous absorption feature detected by the EDGEScollaboration in 50-100 MHz range.

EDGES of the dark forest: A new absorption window into the composite dark matter and large scale structure