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Using the First Light And Reionisation Epoch Simulations (\textsc{Flares}) weexplore the dust driven properties of massive high-redshift galaxies at$z\in[5,10]$. By post-processing the galaxy sample using the radiative transfercode \textsc{skirt} we obtain the full spectral energy distribution. We explorethe resultant luminosity functions, IRX-$\beta$ relations as well as theluminosity-weighted dust temperatures in the Epoch of Reionisation (EoR). Wefind that most of our results are in agreement with the current set ofobservations, but under-predict the number densities of bright IR galaxies,which are extremely biased towards the most overdense regions. We see that the\textsc{Flares} IRX-$\beta$ relation (for $5\le z\le8$) predominantly followsthe local starburst relation. The IRX shows an increase with stellar mass,plateauing at the high-mass end ($\sim10^{10}$M$_{\odot}$) and shows noevolution in the median normalisation with redshift. We also look at thedependence of the peak dust temperature ($T_{\mathrm{peak}}$) on various galaxyproperties including the stellar mass, IR luminosity and sSFR, finding thecorrelation to be strongest with sSFR. The luminosity-weighted dusttemperatures increase towards higher redshifts, with the slope of the$T_{\mathrm{peak}}$ - redshift relation showing a higher slope than the lowerredshift relations obtained from previous observational and theoretical works.The results from \textsc{Flares}, which is able to provide a better statisticalsample of high-redshift galaxies compared to other simulations, provides adistinct vantage point for the high-redshift Universe.

First Light And Reionisation Epoch Simulations (FLARES) III: The properties of massive dusty galaxies at cosmic dawn