They're run out of physical planets. Maybe a giant ship orbiting a planet... Oh wait, the Dreadnaught. Well, we can still get Mercury actually. And maybe we get to explore the Prison of Elders later on. Not just the arena, but more. We get to lock things in their cells and get engrams for it. The harder the target, the better the reward.
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We could all become batman locking away intergalatic scum lol