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We propose 880ks XMM-Newton observations of the most massive bright high-redshift galaxy clusters in the Universe detected in the first All-Sky Survey. The XMM-Newton data will enable detailed studies of the density and temperature structure of the intracluster medium (ICM) in these clusters of galaxies. Precise ICM mass measurements and temperature information will enhance the pioneering eROSITA studies of the evolution of baryons in their deep potential wells by constraining the properties of this crucial massive cluster population. Furthermore by combining the eROSITA data with the proposed XMM-Newton follow-up observations we will constrain the detailed structure formation process as a function of mass redshift and environment as well as understanding the (an-)isotropy of the Universe. [truncated! Please see actual data for full text]