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IDCS J1426.5+3508 is arguably the most massive comma very high redshift virialized cluster comma with many galaxy redshifts comma our strong and weak lensing data comma our strong SZ detections comma and a large X-ray flux from our Chandra observation. We propose a 194 ks observation to measure the global temperature and temperature profile comma determine the metallicity comma derive Y_X comma find the density comma pressure comma and entropy profiles comma and determine if this is a cool core or merging cluster. The pressure profile will be compared to our MUSTANG2 high resolution openPar9.closePar SZ image comma providing a test for clumping. The abundance will test chemical evolution models for cluster galaxies given the early epoch. Even one high z comma high mass relaxed cluster with an accurate mass can constrain LambdaCDM and non-gaussianity.