Looks like you completed all the underworld content this update. Don't know why that hint is showing without more details. Maybe completion order of quests.
What platform are you on?
On PC the latest version i think before 0.5. Awesome work so far. A spell for at least a bit of constant mana regeneration for bernie would be nice because once out of mana she becomes pretty useless at some point in the underworld depanding if she can use potions or nor. (posessing a corpse or not). Greetinx