As the Blessed Oracle, Lucivar was rewarded whenever his action was aligned with a God.
Back when he tricked and killed Darwin, effectively eliminating the only threat—he had at the time, Loki rewarded him with Gleipnir's Echo, which he never took off ever since. It also came in handy most of the time.
An artifact that he was thankful for.
So naturally, with his performance in the blue dungeon—Sutekh also rewarded him.
He obtained the Fang of Ankh.
Due to the excruciatingly painful trials that he had to go through—frankly speaking, he forgot that he would be rewarded with a celestial artifact. It became a pleasant shock when Lucivar realized Sutekh had prepared a gift for him.
Under Sha's guidance, he checked what the Fang of Ankh was all about.
Lucivar marveled at his dagger.