Not Quite a Grognard
Simple question: you’re a warlock, and for whatever reason you’ve chosen Demiplane as one of your Mystic Arcana. What do you do with it? Remember, you can cast it once per day, and you can access the plane for one hour during that time. The Mystic Arcanum is not a spell, so you can’t hack it using effects that interact with spells or spell slots. You can assume any other details about your warlock build that you like (patron, invocations, spells, whatever). Discuss!