The initials of the sentences spell out 'BEGINNING IS END', the text itself describes a cycle. The images on the right describe encounters of Thor with Jörmungandr, the first one shows Thor trying to lift Jörmungandr disguised as cat, the second one shows Thor encountering the world serpent while fishing and the third one just shows Thor fighting(The third encounter of Thor with Jörmungandr happens at Ragnarök where they fight to the death).

In Norse mythology Ragnarök begins when Jörmungandr lets go of its tail(graffiti).

So with the images describing Jörmungandr, the text and the initials of the sentences describing a cycle or an ouroboros and the graffiti mentioning letting go in the context of Ragnarök the solution ot the puzzle is Jörmungandr.