Golden flame

"As the pain from Harry’s scar forced his eyes shut, his wand acted of its own accord. He felt it drag his hand around like some great magnet, saw a spurt of golden fire through his half-closed eyelids, heard a crack and a scream of fury."

- Description

During the Battle of the Seven Potters, Voldemort attempted to kill Harry. Because Harry's wand "sensed" Voldemort's presence, it let out a jet of golden light. This spell is used to crack the opponent's wand when the duellers are locked in a similar matter of Priori Incantatem.

This was a spell that Harry Potter's wand shot at Lord Voldemort, of its own accord during the Battle of the Seven Potters. The spell was powerful enough that it broke Lucius Malfoy's wand.

It was later explained to Harry that the reason his wand had acted the way it did was due to the unique connection between himself and Voldemort. His wand had sensed Voldemort's presence both as "brother" and "mortal enemy" and reacted, despite the fact that Voldemort was using another wand at the time.

Known practitioners

 * Harry Potter (indirectly)
 * Harry Potter's wand

Appearances

 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 1

Notes and references
This spell may only act when the caster is unconscious or the wand itself will cast the spell, subconscious to the person wielding the wand; as this spell was only used once.