Complete the Orrery Lost Sector on Nessus, and loot the Lost Sector chest.
Defeat a strong adversary in any Portal activity while using your Void subclass.
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Your Ghost's scans detect a source of Void energy on Nessus. And though you can't make out any words, you do hear whispers from the depths of the Orrery. Investigate, and bring anything you find back to Ikora.
Ikora believes you're now capable of turning your Void Light against even stronger foes.
Seek out combatants whose prowess is worthy of your burgeoning abilities.
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Void hungers, does it not? It yearns for the antithesis of its own profound desolation.