Engage with Calus's forces aboard the Derelict Leviathan and drive them back by completing tiers of the Nightmare Containment public event in the Castellum.
Additionally, explore the Pleasure Gardens and Royal Pools.
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The Vanguard has tasked you with engaging Calus's forces aboard the Derelict Leviathan. Complete Nightmare Containments to further Eris's research and suppress Nightmare flare-ups.