When Savathûn's Lucent Hive threaten the source of the Guardians' power, survival depends on the fragile alliance between the Vanguard and Empress Caiatl. Wielding a spear imbued with Light-suppressing technology, the Guardian must work with Lord Saladin and Caiatl's most trusted Psion to search for secrets in the minds of the Lucent Hive and stop their ghoulish plans.