This quest is not available in game.
With blood, Kirtonos may be summoned. It is with blood, then, that Kirtonos must be destroyed.
Within the Chamber of Summoning, you will find a brazier, upon which you shall place a drop of your own blood. Kirtonos will come - he cannot resist. When he appears, unleash the fury and wrath of a thousand innocent deaths upon him.
Should you succeed, you will earn more than just our gratitude.