Mysterious worm-like aliens fall from the sky. They penetrate through the ears or nose into human beings and live off their brain while dominating the body. Now with human appearance, the parasites live among humans.
"Jag vet Håsten och Holmsten, bröderna, vara runkunnigast bland män i midgård. De satte stenen och stavar många efter Frösten, fader sin." - "I know Håsten and Holmsten, the brothers, to be the most skillfull in runes among men in midgård. They put the stone and many staves for Frösten, their father."