Lífþrasir

Lífþrasir (Halkeginian: Lífþrasir, "love of life") is the fourth familiar of the void. It is also known as the "Heart of God".

In the anime, Saito became Lífþrasir when Tiffania summoned him as her familiar.

Known Lífþrasir

 * Sasha
 * Saito Hiraga

Name
Lífþrasir is named after Lífþrasir from Norse mythology, one of two humans who will survive Ragnarök.