The Emerald Eclipse - Thomas K. Carpenter - Bog

The clans are on the verge of war.
Pandora and her Drops clanmates discover the existence of an elixir that allows for perfect faez crystal attunement-which will give imbibers a way to match the best stones with the best warriors-signaling the balance of power in the Undercity is about to change. While Razor clan, desperate to keep up with the escalations allies with the Crows, a gang from the city who can supply much needed manpower in exchange for faez crystals and training their members in the ways of the waku.
Both clans have a new foe to worry about, as the smaller clans that they'd previously ignored, come together to form the Alliance. Together with the attunement elixir and their superior numbers, this third clan has pushed the Undercity to the brink of war. The only question is who will strike first.