Balder

Balder (also Baldr or Baldur in other versions) was the Norse Aesir god of light, spring and purity, and the beloved son of Odin. He was eventually killed by the trickster god Loki.

The Sword of Summer
Balder is mentioned by Loki, when the latter grieves about the fate that his sons Vali and Narfi suffered as part of his punishment for killing Odin's beloved son.

Abilities

 * Invulnerability: Thanks to the efforts of his mother Frigg, Balder's body was invulnerable to seemingly every object that might potentially harm him, with his only known weakness being a branch of mistletoe.

Trivia

 * Balder is the only major Norse god to die before Ragnarök, yet he is destined to be resurrected after the Twilight of the Gods is over.
 * Balder's Greco-Roman counterpart (in terms of attributes) is Apollo.