This Blade of Ours by Shalini Abeysekara

Death isn’t finished with them yet.
Sarai believed the worst was behind her. However, months after exposing the government’s corruption in what has now been deemed “the Great Unravelling,” she faces scorn from citizens who preferred her and Kadra as the underdogs. Worse, eerie omens rock the country: from a deadly plague outbreak to a sweeping madness that leave the afflicted ranting of an approaching reckoning. Accused of angering the gods, Sarai returns to the only place that can clear her name: Ur Dinyé’s frozen north. But among the secrets buried in its ice are Kadra’s.

When historical tensions between the north and the south worsen, a powerful religious order seizes control in the chaos, led by a man whose very voice can kill—Noceo bu Kader. Trapped between love and a crumbling country, Sarai and Kadra must outwit a power with roots as deep in fear as in cruelty. But the gods are always watching, and Sarai and Kadra may not escape a second time.