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Resonant spectra of highly charged ions are evaluated numerically in the presence of super intense high-frequency laser pulses up to 1022 $\un{W/cm^2}$. The associated field strengths are still small compared to those inherent in highly charged ions, restricting us to the relativistic multiphoton regime. We predict the emission of hard X-ray radiation due to near-resonant multiphoton interaction with clear relativistic signatures for the one-electron ions $\chem{Xe^{53+}}$ and $\chem{U^{91+}}$.