Beldr

Beldr (ベル・デル, Beru Deru) is an important demon in Shin Megami Tensei: Devil Survivor. It appears as a powerful boss, that cannot be hurt by anything except Mistletoe.

History
Beldr is probably derived from the Norse mythology god Balder (Baldr), a god who was depressed after a dream of his death. Balder's mother made every creature on Earth (except mistletoe) vow to never hurt it. Loki heard this and made a Mistletoe Spear and gave it to his blind brother; who threw it at him (Since everyone threw things at Balder due to everything bouncing off), This ended up killing Balder.

Appearances

 * Shin Megami Tensei: Devil Survivor: Bel God