Bealdor is the God of Light, illuminating all the world. Coddled and sheltered by his mother since he was young, he neglected wordly affairs. This offended Hel, who began to resent him.
Bealdor's mother once asked all the world's creatures to swear an oath not to harm him. They agreed, and he became impervious to danger. Now he can stand at the front line of any battle without fear. His powers of destruction are not to be underestimated. When he brandishes his longswoard, Skee - made from the first rays of the dawn - he can perform quick and furious attacks. As an Eidolon, he is considered proficient in both attack and defense.
'Bealdor' is the Old English equivalent of the Old Norse 'Baldr', who is god of light and purity in Norse mythology. In the legend, Baldr and his mother had a dream of his death. Since dreams were said to be prophetic, this depressed him, so his mother Frigg made every object on earth vow never to hurt Baldr. All objects made this vow except mistletoe, which was considered too unimportant and nonthreatening to bother asking it to make the vow. Or alternatively, too young to even make a vow.
Bealdor's dark presence, Halthim, is based on Höðr. Höðr is a blind god and the brother to Baldr. When Loki found out about Baldr's one weakness, he made a spear from mistletoe and tricked Höðr to shoot it at Baldr.
Upon Frigg's entreaties, delivered through the messenger Hermod, Hel promised to release Baldr from the underworld if all objects alive and dead would weep for him. All did, except a giantess named Þökk, who was presumed to be Loki in disguise. Thus was Baldr forced to remain in the underworld. After Ragnarok, he would return from Helheim, along with Höðr, and rule the new earth together.