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New facilities like TESS will soon boost the number of known terrestrial planets around M stars. Stellar X-rays can severely affect planetary atmospheres comma but more than 40% of the M dwarfs within only 10pc lack appropriate data. We comma thus comma propose to continue our X-ray and UV XMM-Newton survey of all 37 still X-ray undetected M0-M4 dwarfs within 10pc. This 925ks Fulfil Project will provide the ultimate constraint on M dwarf X-ray luminosity function comma plasma temperature comma short time-scale variability and UV spectral energy distribution comma vital input to models of planetary atmospheres comma dynamos and spin evolution comma as a legacy for future stellar-exoplanetary modeling work.