Master wandmaker who crafted Harry's and Voldemort's wands.
Ollivander's expertise reveals the wand loyalty that explains the final duel.
Ollivander tells Harry that the wands from Malfoy Manor belonged to Bellatrix and Draco and senses that Draco's wand will obey Harry.
Ollivander identifies the wand bond that silently decides the final duel.
Ollivander states that Draco's wand, taken at Malfoy Manor, has changed allegiance to Harry after Harry disarmed Draco.
Related entry on Wikidata (Q1072067), public domain (CC0).