Larian Studios Forums Divinity 2 - Ego Draconis (English) Help/Tips/Tricks Help: Chalice Chest

Hello,

I'm stuck with the quest in which I have to free Orobas. I know where to get the roots and I already have obtained the key to open the chest in which I can find the Chalice.
But where is this chest? I've searched the forums and only found topics/posts about the key or the roots. I feel like the chest is in a real obvious place, I just can't find it!

Thanks for the help.