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We demonstrate the existence of a generic, efficient and purely gravitationalchannel producing a significant abundance of dark relics during reheating afterthe end of inflation. The mechanism is present for any inert scalar with thenon-minimal curvature coupling $\xi R\chi^2$ and the relic production isefficient for natural values $\xi = {\cal O}(1)$. The observed dark matterabundance can be reached for a broad range of relic masses extending from $m\sim 1 {\rm k eV}$ to $m \sim 10^{8} {\rm GeV}$, depending on the scale ofinflation and the dark sector couplings. Frustratingly, such relics escapedirect, indirect and collider searches since no non-gravitational couplings tovisible matter are needed.

Despicable Dark Relics: generated by gravity with unconstrained masses