I feel like they are gonna have another test again in this episode, but this time, for each element they will represent. You know that scene in the trailer with the Young 6 looking at the destroyed tree?Well, they have to go through the Everfree Forest. Which is pretty wild right now if you ask me. They would probably have to fight through it just to get to the cave where the Tree originally was. And the Tree would've been observing if its spirit was still around. Like making the Everfree Forest a real test for them to go through, like the first episodes of MLP.
Or, maybe their actions while making the memorial for it will be a test as well, where they have to work together to make it. And then when they finish or place the memorial where the tree was, it could do a trigger that will transport them to where that scene is with the ToH and Young 6 in the trailer. Like the Magical Mystery Cure, or something. Makes sense to put references to the earlier episodes of MLP since this is the last season, making fans nolstalgic or something. Eh, I'm just putting ideas out there.
Let's just say, I'm looking foward to this episode. Curious to what this one brings!