Bring the Singing Skull to Eris Morn to complete your terrifying new instrument of war.
"The skulls have been gathered, and the final instrument set to join your symphony… the eroded grooves upon their jaws, cheeks, and palates providing the secret frequencies of the hallowed Deathsong. Its mysteries are now ours to bind and enslave. Its power is now yours to inflict at will. You are choir and conductor. You are, as ever, death." —Toland, the Shattered