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We report a detection of an absorption line at ~44.8 {\AA} in a > 500 ksChandra HRC-S/LETG X-ray grating spectrum of the blazar H 2356-309. This linecan be identified as intervening CV-K{\alpha} absorption, at z\approx0.112,produced by a warm (log T = 5.1 K) intergalactic absorber. The feature issignificant at a 2.9{\sigma} level (accounting for the number of independentredshift trials). We estimate an equivalent hydrogen column density of logN_H=19.05 (Z/Zsun)^-1 cm^-2. Unlike other previously reported FUV/X-ray metaldetections of warm-hot intergalactic medium (WHIM), this CV absorber lies in aregion with locally low galaxy density, at ~2.2 Mpc from the closest galaxy atthat redshift, and therefore is unlikely to be associated with an extendedgalactic halo. We instead tentatively identify this absorber with anintervening Warm-Hot Intergalactic Medium filament possibly permeating alarge-scale, 30 Mpc extended, structure of galaxies whose redshift centroid,within a cylinder of 7.5 Mpc radius centered on the line of sight to H2356-309, is marginally consistent (at a 1.8{\sigma} level) with the redshiftof the absorber.

An X-ray WHIM metal absorber from a Mpc-scale empty region of space