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Role in the story

Lunka is Coen's sister and one of the most important figures in the story of The Blood of Dawnwalker, even though little has been revealed about her directly. She contracted the Black Plague, and when conventional medicine failed, Brencis offered to cure her using vampire blood. The cure worked — Lunka survived — but it started a chain of events that trapped Coen's entire family under Brencis's control.

The cure and its cost

Vampire blood curing the plague is presented as a genuine miracle in the world of The Blood of Dawnwalker. For Coen's family, it was a matter of watching Lunka die or accepting help from a vampire lord. They accepted. Brencis then leveraged this debt to take control of the family. The exact terms of the arrangement and what Brencis wants from them are part of the game's central mystery.

As a character

The developers have described Lunka as a "cryptic figure" who is pivotal to the story. This phrasing suggests she's more than a simple damsel-in-distress motivation for Coen. Whether the vampire blood that saved her also changed her in some way, or whether she's developed her own agenda during her family's captivity, hasn't been shown.

What we know for certain: she's one of Coen's four siblings, she contracted and survived the plague thanks to vampire blood, and rescuing her is part of Coen's 30-day mission. Beyond that, the developers have kept her story deliberately obscured.