Neutrinos and magnetic fields may play similarly important roles in the collapse and explosion of a subset of massive stars. Determining the explosion mechanism as well as its impact on the nucleosynthesis and the propagation of the ejecta requires long-time simulations. I will present such models performed for several sets of pre-collapse models and describe the neutrino physics that went into them, including new developments on the minimally implicit time integration of the stiff neutrino-matter interaction terms.