So I saw this video on the forums. It's a great video overall but a lot of people ask why we don't have trading and at 8:41 in the video he tell's you pretty much why. Overall a great video might answer some things you were wondering about as well.
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5 Replies*explains the ghost* "He's going to be you guide on the way, he'll direct you to your next explosive battle, he'll be your constant companion on the way" What the ghost actually does. - Open doors