Hodr by Helerion

Hodr (Hod, Hoder, or Hodur): The god Baldur, who is often portrayed as being a charming, beloved, innocent sufferer, had dreams that foretold his imminent death. His mother, Frigg, went around and obtained oaths from everything in the world that they would not harm her son. The only being she omitted was the mistletoe, as she thought it to be too small and harmless a thing to be of any real consequence in this matter. When the wily trickster Loki discovered this oversight, he fashioned a mistletoe spear.

While all the gods were amusing themselves by throwing every available projectile at Baldur and laughing as the things bounced off of their unharmed companion, Loki approached Hodr with the mistletoe spear. He convinced Hodr to throw the spear at Baldur to contribute to the game and to honor the strength of his brother. (Hodr and Baldur were both sons of Odin.) With Loki guiding his hand, Hodr launched the spear at Baldur. The weapon pierced him, and, to the shock and horror of all present, he fell down dead on the spot.