in Figure (b) also warrants further discussion. As is seen, regardless of the active space employed as reference, tPBE0 performs about 0.15 eV worse than NEVPT2 on this large class of transition metal dimer excitations. We first note that these results are not representative of the performance of tPBE0, which has been shown in several studies to produce results on-par with NEVPT2. Indeed, as shown in Table , tPBE0 is able to exceed the performance of NEVPT2 for two larger transition metal systems. We speculate that this difference in performance may result from the unique nature of the transition metal dimers, in which half of the atoms in each molecule are composed of transition metals; the density around metals without ligands may be more difficult to describe by the CAS reference and the NEVPT2 perturber states may be able to overcome this difficulty better than tPBE0. Regardless, the poor performance of tPBE and tPBE0 on these systems serves as a key motivation for the development of new multireference density functionals for use with a CAS reference. In summary, this study presents another step towards reliable and accessible multireference calculations for a wide range of chemical systems. As in our previous studies, we have made all wave functions for the studied excitations freely available. We hope these large databases of converged wave functions will provide a platform for the testing and development of related methods.