Larian Studios Forums Divinity 2 - Ego Draconis (English) Help/Tips/Tricks Last floor in Battle Tower

I got into battle tower and done all rooms even the basement searched all chests killed the 2 lvl 17 masters and got 2 keys but now im at the top floor at a door thad i cant open... and i have 1 chest thad i cannot open with lockpicking in the room where you can light 2 candles and a secret room appears pls help i dont know what to do

go to the goblin behind the locked door on the 2nd floor, mind read him