Keratrix is a minor character in The Defenders of Shannara trilogy. He is a young Druid who replaces Sebec as the personal assistant to the Ard Rhys Aphenglow Elessedil. He later becomes Isaturin's assistant when Isaturin succeeds Aphenglow as Ard Rhys. Keratrix is one of the few Druids who know in advance that Aphenglow is about to die, and says goodbye to her before she boards an airship to travel to the Hadeshorn and pass away.