  We present a robust, continuous molecular decelerator that employs high
magnetic fields and few optical pumping steps. CaOH molecules are slowed,
accumulating at low velocities in a range sufficient for loading both magnetic
and magneto-optical traps. During the slowing, the molecules scatter only 7
photons, removing around 8 K of energy. Because large energies can be removed
with only a few spontaneous radiative decays, this method can be applied to
nearly any paramagnetic atomic or molecular species, opening a general path to
trapping of complex molecules.
