Individual measurements of [Fe/H], [Mg/H], and [Mg/Fe] as a function of σ _v (top row) and M _* (bottom row). The Heavy Metal galaxies are split into z ∼ 1.4 (blue triangles) and z ∼ 2.1 (green stars) samples. We include results from other studies of massive quiescent galaxies at similar redshifts (see legend in Figure 2). We compare these results to individual abundance measurements from the MASSIVE survey (z = 0; Gu et al. 2022; open circles), SDSS (z ∼ 0; Zhuang et al. 2023; black diamonds), and LEGA-C survey (z ∼ 0.7; Beverage et al. 2023; gray dots), with their typical uncertainties provided at the bottom of each panel. At constant M _* and σ _v , galaxies at z > 1 have different chemical properties than those at lower redshifts.