If a magnetar's magnetic field decays before mass limits are reached, what does it become?
Answer
A standard, though still incredibly dense, neutron star
The long-term fate of a magnetar is determined by a race between two physical processes: the dissipation of its powerful magnetic field and the proximity of its total mass to the gravitational collapse threshold. If the magnetic field weakens sufficiently over time due to natural decay processes, the object loses the distinctive attribute that defined it as a magnetar. Consequently, it reverts to being classified as a standard neutron star. Although it sheds its Giga-Tesla-strength field, it retains the extreme density inherited from the core collapse of the original massive star.
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