Elysia Raymund can be found inside of the Harrow Crypt that is behind the undead infested church north of Granite Falls. From Elysia continue further into the crypt. When you reach a point where the floor has a giant hole in it, follow the ramps that leads downward. On the far end of this room you will find the Shadefilled Horror, at 5125, 4906. Slay him and collect Elysia's Pendant and return it to her for your reward.