Reread Review: Thunderhead (The Arc of a Scythe #2) by Neal Shusterman

After becoming a scythe, Citra tries to stop the growing corruption of the scythdom from within, while Rowan has become the infamous Scythe Lucifer after being denied his scythe ring. He has been finding corrupt scythes and killing them - truly killing them - and the Thunderhead has done nothing to stop him.