Novitiate's Tarnished Arcanoscope

Source
This item drops from chests on Argus. It is also a reward from the following Class Hall missions:
 * Augmenting Our Assault
 * Chink in the Armor
 * Demon Exterminators
 * Go to Fel
 * Resist the Tide
 * Return Fire
 * Coalescing Void
 * Encroaching Gloom
 * Fabric of Reality
 * Memories of the Lost
 * Preserving Memory
 * Their Emancipation
 * Buried
 * Crystallized Fel
 * Cull Their Numbers
 * Fel Machinery
 * Legion Jailbreak
 * Pierce the Heart