The Osirian Scripts 

According to the Osirian Scripts, there are sentinels and teachers that watch over us.  We are imprisoned in our physical bodies. The teachers show us the way while the sentinels keep guard over the phsyical plane. The sentinels have the power to create a "magnetic conveyance" between the material and spiritual planes. When this magnetic shield rips they can materialize in a form which resembles flying saucers, repair the ripped magnetic field, and then dematerialize again.