I got this W.I.T.C.H. novel when i was probably 9 (around 2009) and these stupid tree people scared the christ out of me and still I don't love them. I no longer remember which one it was and I don't have it anymore.
It started out with the girls at a beach and going into a tunnel under the sand which was made of glass? I remember a lot of it actually.
If someone could help me find it based on this screenshot it would be HIGHLY appreciated.
My god, even this screengrab from whatever it is creeps me tf out.
Edit: text is italian for "what have I done?"
EDIT: Comic Issue #15!
And again, now that I've seen it once more, I can see why I hated it so much as a kid.