The Minstrel's Ballad: Hades's Elegy

The Crown of the Immaculate (Extreme) is an 8-man trial introduced with Final Fantasy XIV: Shadowbringers.

Lore
Hearken unto a requiem for a hero fallen. A man who lived a thousand thousand of our lives clinging desperately to faint hope, never shirking his sworn duty to his long-lost brethren. A man who stood proud and did avow his true name on the threshold of the battle that would see him fall to his rival─the light to quench his shadow. Borrowing liberally from the funereal rites of the Night's Blessed, the minstreling wanderer weaves an elegy in that hero's honor─the tragic-yet-triumphant tale of a man and a battle that ne'er shall be forgotten.

Bosses

 * Hades