The Limbo Lenses allow Ava to see creatures whose souls have been stuck in Limbo, and creatures like Wrathia's warriors who are attached to hosts while in limbo.
When a pact is made, Ava will then see the host in the form of the soul with which the pact was made through the Limbo Lenses, at least while the host is unconscious. For example when Ava sees Maggie Lacivi, while wearing the lenses, the body of Tuls is seen in her place.
The lenses also allow Ava to see the smaller souls of insects or creatures, which have gotten lost in the limbo between life and death.
- The space dust seen when Ava first puts the Lenses was put there by Wrathia to condition her eyes to see the dead.
- Odin has nicknamed the limbo lenses "pervert goggles," alluding to his teasing of her use of them on Maggie in Chapter Ten.
- The Limbo Lenses only work with Ava.
- The Limbo Lenses are not indestructible.
- The Limbo Lenses bear a strong resemblance to the eyes of the species Vengess; as Wrathia was a vengess, and she made the glasses, this was most likely intentional.