The Fornax dwarf spheroidal galaxy has an anomalous number of globular clusters, five, for its stellar mass. There is a longstanding debate about a potential sixth globular cluster (Fornax 6) that has recently been "rediscovered" in DECam imaging. We present new Magellan/M2FS spectroscopy of the Fornax 6 cluster and Fornax dSph. Combined with literature data we identify ~15-17 members of the Fornax 6 cluster, showing that this overdensity is indeed a star cluster and associated with the Fornax dSph. The cluster is significantly more metal-rich (mean metallicity of [Fe/H]=-0.71+/-0.05) than the other five Fornax globular clusters (-2.5<[Fe/H]{<}-1.4) and more metal-rich than the bulk of Fornax. We measure a velocity dispersion of 5.6_-1.6_^+2.0^kms^-1^ corresponding to an anomalously high mass-to-light of 15