Pillars of Eternity II: Deadfire

This quest will be given to you by Arkemyr.
First though, you will have to finish “The Archmage's Vault” quest – given by Tumara and Netehe (two women arguing outside of the Arkemyr's Manor in Periki's Outlook area of Neketaka). After you finish this quest and give the tablet to one of the women, Arkemyr will send an imp to invite you to his mansion. Go to him and he will give you “Berkana's Folly” quest. From there, just follow the questline.

If you struggle, use this walktrough : https://pillarsofeternity.gamepedia.com/Bekarna%27s_Folly