Hydrodynamical cosmological simulations have proven to be a great tool for understanding the physical mechanisms regulating the baryonic gas properties and their large-scale distribution. Using the IllustrisTNG simulation, we investigate the distribution and evolution of the ionised metals CII, CIV, MgII, NV, NeVIII, OVI, and SiIV, within filaments, haloes, and voids from redshift z = 6 to z = 0. Our results provide new hints at the well-known missing baryon problem. We find that the Warm-Hot Intergalactic Medium (WHIM) accounts for approximately 46% of the baryons at redshift z ~ 0. We also show that OVI, NeVIII, and NV are good tracers of the warm/hot and low-dense gas at low redshifts, regions that are plausible to contain most of the missing baryons in the local Universe.
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