It's cool and creepy at the same time

The iron in your blood is paramagnetic and the magnetic field generated by a Magnetar IS powerful enough to do it.

Magnetars are the most terrifying things in existence...to me

They should be.
On December 27th, 2004 a burst of energy from Magnetar SGR 1806-20 wreaked a little bit of havoc on Earth.
It was detected by the then newly launched Swift satellite, the energy instead passing through the side of the craft and it still overwhelmed the cameras.
Several other satellites were knocked out, it ionized the upper atmosphere and it made Earth's magnetic field ring like a bell.

Oh and I almost forgot... SGR 1806-20 did this from a distance of 50,000 lightyears, on the other side of the galactic core.

I don't know too much about the sort of energy neutron stars put out, but the force of gravity is bound to be much higher than its magnetism.

Neutron stars are known to be very small, but usually hundreds of times more massive than stars like our sun.