The bridge Gjallerbru lies at the end of the Helway in Niffleheim, spanning the river Gjoll to Nastrond. It was guarded by Modgud, who made sure that the dead did not escape Hel.
During Muspelheim's invasion on Niffleheim, Gjallerbru was destroyed by Thor with his Bomb Hammer in order to intercept a train carrying Niffleheim's former regent Hela.
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