Balder was the most valued god. Everybody practically worshiped him.
One night he had a bad dream that he was slain by an unknown enemy.
Balder went to the council to tell everybody that he scared he might be hurt or die.
Frigg went into the 9 worlds to give him power to not be hurt by anything at all. Loki became very jealous of balders new power.
Loki then disguises himself and asks frigg why nothing is hurting balder. Frigg says she didnt ask for mistletoe to harm him.
Loki then goes to the eastern side of vlhalla to grab some mistletoe.He then asks Hodd if he wants to throw it at him. Hodd could not see so Loki helped him aim it and it shot right into the heart of Balder.