Magnus Chase Sumarbrander, Sword of Summer Rune Pendant with Magnetic Clasp.

This is a prop necklace for the singing sword named Jack from the Magnus Chase book series. The pendant and hoop both have hols for 5mm magnets. In the book, the gold pendant has the Fehu rune on it, the symbol of the god Frey. The rune is supposed to be able to come off of the necklace part with a tug and turn into a sword. I could not model that into existence.