You follow the sound, around you the grass was more and more thick and vines started do appear in around you. Once arrived you noticed that the tree was a lot older, their branches were oppen and a light blue sap was pourring around them like water forming a strange lake like formation around those tree.

Go up and touch the blue water like sap

After a while you finaly found an second oppening, a trapdoor behind the ruin. It look like it go down in a basement of some sort. You will have to jump down if you want to go there as the old lader that was here had rotten but the drop is not too far down so you don't risk to hurt yourself. However you may nead to take another way to get out.

I decided to head back later

It feel slimy and cold and tickle a bit but is relatively armless. You notice that some small shells are stuck inside the dryed sap around the edge of the tree. It seem like there is creatures that live in this place. As you remove your hand of the substence your nails start to glow a bit but it stop after some time.

i'll jump in and worry about getting out later

you crawl back out of the invocation room and go up the lader. Once back outside the stone beast you scan the area again, there was still the staircase and the tail room to explore from what you could see from there.

Once inside you notice a stone door on your right, in front of you is a staircase that go seemingly on the ground level where the entrance was.

i'll go up the staircase to the ground level

try to take some of the shells