Larian Studios Forums Beyond Divinity (English) Help/Tips/Tricks Tree of Realization? Where is the entrance??

I admit it - I peeked at the walkthrough to see if I was missing any really cool items or quests. I found the mention in Act II about the hidden entrance to the underground passage to this Tree, but I can't find it. Help, Please?!!

http://beyond.divinedivinity.net/help/act2_forest_sw.htm

Number 12 on Hellfighter's map link.
BUT! You have to free Stignix (imp patrol guy) out of the Spider Queen's claws in Spider Forest first - otherwise, no cutscene, no option to choose from <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />