After you pass through into the chamber, the goblins are more confident to follow you. You examine the slab more closely.
Perception: (d20-2)[17]
You notice some writing on the stone:
Karrin,
If you are reading this, you probably killed the demon that enchanted me. Don't worry too much about me; this is the kind of stuff I'm best at anyway. I'll be back with the sword before you know it.
Lyanna