The Sapphire Stratagem

After Razor clan's destruction, the remaining members join the Drops clan, keeping alive the hope that they might survive the ascendant Alliance. The newest clan in the Undercity has all the advantages-warriors, weapons, and a cunning maetrie leader that has outmaneuvered them at every turn.

The leaders of Drops clan believes they have one shot to end the upstart clan's hold on the Undercity.

A strike, right into the heart of the enemy, could put an end to the Alliance. But achieving that goal will require
them to overcome not only magical fortifications, but each other, as old enmities bubble to the surface under the stress of achieving something most think impossible. If Kuma, Pandora, and the other young waku can't come together as a team, then they'll lose the Undercity-and their clans-forever.