  Observational and theoretical work has now established that the fossil fields
of magnetic massive stars are surviving remnants from an earlier event, or an
earlier evolutionary phase. However, many important questions remain regarding
the effects of these fields on the late stages of stellar evolution, as well as
their impact on the core-collapse mechanism and the formation of exotic compact
objects such as magnetars and gravitational wave progenitors. There is
currently a critical need to incorporate the impact of fossil fields in models
of the structure and evolution of magnetic stars, and to determine the
evolutionary history of magnetic massive stars. We present a preliminary
population study of a cluster of co-evolving stars based on MESA evolutionary
tracks that account for the effect of magnetic mass-loss quenching.
