The Bone Shard War by Andrea Stewart — book slip

Lin Sukai has secured her first victory as Emperor, but the Phoenix Empire's future remains uncertain. With treacherous governors and the Shardless Few renewing hostilities, Lin faces threats from all sides.

Her old nemesis Nisong has allied with the rogue Alanga, Ragan, both seeking her demise. Legend speaks of seven mythic swords that could turn the tide if Lin finds them first.

Failure means the fall of the Sukai dynasty and the empire itself.