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We present the largest full N-body simulation to date with local primordialnon-Gaussianities (L-PNG), the \textsc{PNG-UNITsim}. It tracks the evolution of$4096^3$ particles within a periodic box with $L_{\rm box} = 1 \; h^{-1}\,{\rmGpc}$, leading to a mass resolution of $m_{p} = 1.24\times 10^{9}\;h^{-1}\,M_\odot$. This is enough to resolve galaxies targeted by stage-IVspectroscopic surveys. The \textsc{PNG-UNIT} has \textit{Fixed} initialconditions whose phases are also \textit{Matched} to the pre-existing\textsc{UNIT} simulation. These two features in the simulations reduce ouruncertainty significantly so we use 100 \textsc{FastPM} mocks to estimate thisreduction. The amplitude of the non-Gaussianities used to set the initialconditions of this new simulation is $f_{\rm NL}^{\rm local} = 100$. In thisfirst study, we use mass selected dark matter haloes from the \textsc{PNG-UNIT}simulation to constrain the local PNG parameters. PNG induce a scale dependentbias, parameterised through \bp or $p$, which might depend on the type ofcosmological tracer. Those cases when $p=1$ are referred to as the {\ituniversality relation}. We measure $p$ as a function of the halo mass. Haloeswith masses between $1\times 10^{12}$ and $2\times 10^{13} \, h^{-1} M_\odot$are well described by the {\it universality relation}. For haloes with massesbetween $2\times 10^{10}$ and $1\times 10^{12} \, h^{-1} M_\odot$ we find that$p<1$ at $3\sigma$. Combining all the mass bins, we find $p$ consistent with avalue of $0.955\pm0.013$, which is $3\sigma$ away from \textit{universality},as low mass haloes are more numerous. We also study the effect of using priorson $p$ when constraining $f_{\rm NL}$. Using the values we obtain for $b_\phi$as priors, we forecast that a DESI-like (stage-IV) survey will be able toconstrain $f_{\rm NL}$ better than if the universality relation is assumed.

PNG-UNITsims: the response of halo clustering to Primodial Non-Gaussianities as a function of mass