Beldr a demon antagonist form the DS game Shin Megami Devil Survivor.
Beldr is probably derived from the Norse mythology god Baldr. In this legend, Baldr had a dream of his own death and his mother had the same dreams. Since dreams were usually 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. Frigg had thought it too unimportant and nonthreatening to bother asking it to make the vow (alternatively, it seemed too young to swear).
When Loki, the mischief-maker, heard of this, he made a magical spear from this plant (in some later versions, an arrow). He hurried to the place where the gods were indulging in their new pastime of hurling objects at Baldr, which would bounce off without harming him. Loki gave the spear to Baldr's brother, the blind god Höðr, who then inadvertently killed his brother with it.
Shin Megami Tensei: Devil Survivor
Beldr a King of Bel a very unkillable boss that the party need to get the Devil's Fuge from the male cilvlians after you evade form Beldr. In the cemetery the party fight him and his minions but if they take too long or he'll use Vampire MIst to drain the party's health once the protagonist defeated Beldr the protagonist becomes the War of Bel.
Beldr appeared in Day 3 when the party protects Keisuke & Midori form Beldr after the party saves the cilvlians. In the meantime Beldr works for Lucifer