City of Broken Magic

Five hundred years ago, magi created a weapon they couldnt control. An infestation that ate magic - and anything else it came into contact with. Enemies and allies were equally filling. Only an elite team of non-magical humans, known as sweepers, can defuse and dispose of infestations before they spread. Most die before they finish training. Laura, a new team member, has stayed alive longer than most. Now shes the last - and only - sweeper standing between the city and a massive infestation.