Remati

Remati was a "wrathful deity" and protectress dwelling beneath Daniel Osbourne's retreat. Alongside Vajrayogini and Ekajati, Remati offered protection in exchange of magical power. The trio was invoqued by Willow Rosenberg in order to protect the Slayer Organization from the onslaught of the Twilight Group's army.

Behind the scenes
Though not identified in the issue, Remati's depictions in Tibetan buddhist art depict her as blue. Palden Lhamo a.k.a. Remati on Wikipedia.