The Descent of Twilight
The Descent of Twilight is a weapon said to have been once wielded by Vaelien himself, long before his acquisition of his more famous greatsword, the Vaelien. The Descent of Twilight is enchanted with both light and shadow, possessing capabilities related to both. With light, it can strike at distant foes with blinding speed. With shadow, it can conceal the wearer, or ebb the strength of enemies[1].
Appearance
The Descent of Twilight is a gold-hilted saber, with a blade that glows with a matching gold[1].
History
World Cutter was in Kyestri's vault up until the events of Defying Destiny.
When Taelien visits Kyestri, he magnetizes it, allowing him to prevent Sterling from using it against him in their fight[1][2]. After the battle, it was not mentioned again, but it was likely put into the Jaden Box during the looting of Kyestri's Mansion.
When the Jaden Box is opened in On the Shoulders of Titans, it is not mentioned, most likely either lost in the battle and never put in the Jaden Box or given to Taelien later, as it was previously arranged that he would get "all the swords"[3][4].