How to open the chest in the owlbear cave

Basically: Find the prayer, pick it up, and read it in front of the chest. It won't do anything if you read it where you find it!

[@Noah-ox9zj]

I just asked Withers for one of the hirelings, who happened to be a follower of Selune, and had him open it. Worked for me!

[@Effaly_]

Oh, that's actually very interesting. I never had a hireling or had/played someone who worshiped Selune, so I didn't know about it. Thanks for the tip!