For 10 points, name this Norse god who guards the rainbow bridge Bifrost.
Along with a bound Loki and the Midgard Serpent, this figure is depicted on the west side of the Gosforth Cross. This figure claimed Jarl as his son after sleeping with both Jarl's mother and her husband, and then taught him runes and gave him one of this figure's names. This grandson of Geirrendour or Aegir once took the guise of a seal to rescue the Brisingamen from Loki at the Singasteinn. Sometimes called the White God, he resides in Himinbjorg, and he rides the horse Gulltop and wields the sword Hofund. He can hear the wool grow on a sheep's back and will blow the Gjallarhorn to announce Ragnarok, where he will kill Loki but die from his wounds. For 10 points, name this Norse god who guards the rainbow bridge Bifrost.
Along with a bound Loki and the Midgard Serpent, this figure is depicted on the west side of the Gosforth Cross.
Heimdallr [prompt on Gullintani or Rig; prompt on White God before it's mentioned]