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(Abridged for arXiv) We report the discovery of an unusual, extremelydust-rich and metal-strong damped \lya absorption system (DLA) at a redshift$z_{a}=2.4596$ toward the quasar SDSS J115705.52+615521.7 (hereafterJ1157+6155) with an emission-line redshift $z_{e}=2.5125$. Its neutral hydrogencolumn density $N_{\hi} = 10^{21.8\pm0.2}$ cm$^{-2}$ is among the highestvalues measured in quasar DLAs. The measured metal column density is$N_{ZnII}\approx 10^{13.8}$ cm$^{-2}$, which is about 1.5 times larger than thelargest value in any previously observed quasar DLAs. The best-fit curve is aMW-like law with a significant broad feature centered around 2175 {\AA} in therest frame of the absorber. The measured extinction $A_V \approx 0.92$ mag isunprecedentedly high in quasar DLAs. After applying an extinction correction,the $i$ band absolute magnitude of the quasar is as high as $M_{i} \approx-29.4$ mag, placing it one of the most luminous quasars ever known. Thisdiscovery is suggestive of the existence of a rare yet important population ofdust-rich DLAs with both high metallicities and high column densities, whichmay have significant impact on the measurement of the cosmic evolution ofneutral gas mass density and metallicity.

A Metal-Strong and Dust-Rich Damped \lya Absorption System toward the Quasar SDSS J115705.52+615521.7