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During my campaign, I realized that you can farm in Dark Prince Realm every time that the gateway opens up. You can just go and venture to the portal to give you more rewarding rewards when you get closer and closer to the middle.
I'm exploiting do this so I can have more gold to upgrade settlements every time Ursuns roar since there's no negative impact in general. I believe this should be revamp like adding High Corruption to the Hero's vicinity upon returning since you he/she become twisted with the excess offer made by the Slaanesh prince.