|Taken Name||Savant Vega|
|Magic||Neoteric; Ability to learn quickly|
|Faction||Anti Sanctuary (former)|
|Relations||Richard Melior (husband)|
Savant Vega is the husband of Richard Melior. He is a Neoteric with the ability to absorb vast quantities of knowledge at a glance. Five years before the events of Resurrection, Savant was kidnapped and held hostage by the Anti Sanctuary in order to force Melior to work for them.
Savant met Richard and they fell in love with each other. During the 1960s, they moved to San Francisco. Richard was friends with Parthenios Lilt, who introduced them to other Neoterics. However, Richard began to notice how dangerous these people are and convinced Savant to leave.
Sometime right after the Dying of the Light, Lilt and some others broke into Savant and Richard's home and kidnapped Richard. Azzedine Smoke infused his magic (the ability to control those he touched for 48 hours at a time) into a necronaut suit that he forced Savant to wear, which he couldn't escape once they sealed it. Savant, under the control of the Anti Sanctuary, became Lethe.
As Lethe, Savant executed the needs of the group. As Savant's power allows him to become a quick learner, he became the best fighter in the group and is near unbeatable. However, Skulduggery Pleasant and Valkyrie Cain manage to apprehend him. Lethe tells Richard that if he drains Lethe's life force to resurrect Abyssinia, Savant would be returned to him. Just in time, Temper Fray arrives and tells Richard that Lethe is Savant. Lethe insists that Richard kill him, and an increasingly agitated Richard knocks Lethe out with a burst of energy. Temper unmasks Lethe and Richard finally reunites with (an albeit unconscious) Savant.
At the end of the book, Savant is recovering from Smoke's control. Skulduggery notes that Savant has a lot of work ahead of him and a lot of rehabilitation, but he will have Richard by his side, helping. Valkyrie asks Skulduggery if Richard and Savant will make it through these traumatic events, and Skulduggery replies "They love each other. Love conquers all."
- Savant is a pacifist.
- Back in the 1960s, Savant and Richard had a bowling team with their friends.
- "Lethe" was the Greek spirit of forgetfulness and oblivion. Savant does not literally forget who he is as Lethe, but he does abandon his pacifist nature.