Guildpact

When conflicts arise between the guilds of Ravnica, it’s up to Agrus Kos to prevent the disaster that is sure to come
 
One guild ravages the streets. Teysa—a high-ranking lawmage and Matriarch of the Karlov family—leads another to "cleanse" them. Now the baroness of the desolate and remote Utvara, Teysa is tasked with destroying the plague that ravages the land. But in gaining control of Utvara, Teysa lights a fire beneath archmage Zomaj Huac, who sees the wasteland as a means to conquering all of Ravnica.
 
At first, Agrus Kos couldn’t care less. But as he watches the guilds nip and tear at each other like snakes . . . something clicks.

Now his mind is clear, as are his options. A disaster grows under the city's crowded streets. He alone knows what he must do.