Find Krestal - NWN Side Quest (Chapter 1)
Find Krestal is a side quest that begins by speaking with Drake inside of the Shining Serpent Inn in the southeastern portion of Beggar's Nest. You can also technically start & instantly complete this quest by speaking with Krestal too inside of his home.
All you need to do in order to complete this quest is speak with Krestal. You can find Krestal inside of a Barricaded Home just north of the Shining Serpent Inn. There is no reward for finishing this quest and the moment you speak with Krestal it'll be moved into the "Completed Quests" tab of your Journal. Essentially (it seems) that the purpose of this quest and the Find Jemanie quests are to point you to other NPCs nearby who offer you quests.
Krestal will begin the Beggar's Nest: Sword Coast Boys side quest when you speak to him. If you need help finding Krestal use my map screenshot below.