Discuss Divinity Original Sin, as well as comments posted to our Divinity Original Sin Wiki and Divinity Original Sin 2 Wiki
You HAVE to talk to Xiuh before killing Ryker. after you kill Ryker Xiuh will refuse to talk to you. Then your only option will be to lockpick it witch atm don't close the quest
In the Definitive Edition, using Fane´s mask doesn´t work, I used it with Sebille for the Scholar tag. I needed to respec the Red Prince in order to get the password.
I wonder if the name of the chest, Thrice Bound, is inspired buy the Kingkiller Chronicles which features a similarly named and just as complexly sealed Thrice Locked chest