You cannot access it until you have basically done everything else in the forest. It also comes with another item, but you’ll need to wait until you get it to see what it is.
I have a feeling I know what it is. As far as I know the only things I need left in the forest are the Frostcap for the "other" chest, as well as figuring out what page 16 meant regarding "shaking well (tho i have an inkling im onto that one too)
Its not that I haven’t figured it out, I just haven’t gotten the chance to actually do it yet… The sequence took me on average over an hour, but I’m focusing more on course work. I’ve just been posting from my phone these past few days.