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The 10 deg2 Euclid Deep Fornax Field (EDFF) will be the foremost extragalacticmedium-area deep field due to its unique multi-lambda coverage. We aim toprovide the X-ray view by mapping the entire EDFF at 40ks depth for untoldlegacy value. The XMM data and associated surveys will enable major advances inthe study of AGN and galaxy clusters including: deep characterisation of Euclidclusters and their selection function robust measures of cluster scalingrelations to z=1.5 and the group regime the study of rare clusters and AGN in avariety of environments and revealing the link between AGN feedback and starformation to z>3. We will deliver a complete validated multi-lambda legacydataset that will greatly enhance the AGN and cluster science from the 15000 deg2 Euclid Wide survey. [truncated! Please see actual data for full text]