Complete the Lost Sector Exodus Garden 2A in the Cosmodrome, and loot the Lost Sector chest.
Defeat a strong adversary in any Portal activity while using your Arc subclass.
Flavor text
Your Ghost's scans detect a source of Arc energy in the Cosmodrome. The Servitors in Exodus Garden 2A seem to be guarding it. Investigate, and bring anything you find back to Ikora.
Ikora believes you're now ready to channel your Arc energy against more dangerous opponents.
Seek out foes whose proficiency matches your own.
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"Meditation will only take you so far. To truly understand Arc, you must allow it to race through your very soul." —Ikora