So you have defeated the Arch Illager now. And you have run out of new levels to play. Play through Soggy Swamp. Explore everything. At the end, there is a button. This button will only appear once you have completed Obsidian Pinnacle. Press the button, and it will reveal a secret door. When you enter the door, explore the small room. You will see a floating purple glowy thing of majicalness. Press the button and press X to claim the rune.
Once you are back at camp, go behind the Mystery Merchant. You will find a drawbridge that has a lever on the other side. You will have to go around the other side and press the lever. There is a building. Enter it, and there are pictures of people. (I think they are the developers) At the end of the hallway, there is a picture of a dog. Press X and it will show you what levels you need to play to get more runes. Go past that and there is a doorway. Around it are runes. One should be glowing because that one was the one you collected. Collect the rest.
Once you got the rest, head back to the building. The door will open. Go inside, and there is a chest and something to collect. (I think)
Once you did that, open the map. To the upper left of Creeper Woods, there is a new level that says, ???. Play it. I won't ruin the surprise.
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