The Dark Urge is a great second playthrough of Baldur's Gate 3, allowing you to embrace the darker possibilities of the game and really create a worst-case scenario for the entire land of Faerun. There are decisions to be made here that you normally wouldn't even give a second thought in your first playthrough, and we're here to run them down for you.
THIS ARTICLE CONTAINS MAJOR SPOILERS FOR THE DARK URGE
Table of Contents
The Darkest Parts of The Dark Urge
Scleritas Fel Appears
At some point in Act 1, Alfira the Bard will ask to stay at your camp. You might recognize her from your original playthroughs as a Bard you meet in the Druid Camp, and she's a pretty great character. If you say yes to her spending the night, then you'll violently murder her with extreme prejudice and you'll be given the option to either admit what you did to your companions or hide the evidence.
Regardless of your choice, a weird goblin man in a top hat will appear during one of your long rests, saying he's been looking forward to your return. His name is Scleritas Fel and he claims to know about your history, to know about your past, and to be here to help you realize your darker nature.
Last Light Inn
Once you reach Act 2, Scleritas Fel tells you to kill Isobel the Cleric, the person protecting all of Last Light Inn. Now, if you kill her you'll completely lose the ability to complete several quests, but you also completely destroy Last Light Inn, turning everybody there into a corrupted version of themselves.
During your next long rest, Fel will reappear, telling you that you made the right decision, and giving you the ability to transform into your true form. To transform into your Slayer form, a massive monster with abilities designed to tear apart people who get in your way.
Killing Your Partner
During the night throughout one long rest, you'll have to pass a Wisdom saving throw. If you succeed, then you're fine, but if not you'll kill whoever your partner is in a brutal fashion. If you succeed in that throw, though, then you'll wake up tied up and you'll have three more saving throws to succeed as your lover promises that they'll help you stop your bloodlust.
If you fail the saving throw, you will sadly kill your partner though, and you'll have to try and explain your actions to the rest of your party. There's a high chance here that you fail the saving throw to persuade them that you're safe, and if you do then you'll be faced with fighting all of your party in a one v everyone battle that you'll almost definitely lose, so make sure you make a save before you try the saving throw to not kill your partner.
The Truth Of The Urge
During Act 3, you'll be tasked with finding Orin the Red, and to do so you'll need to seek an audience with the Murder Tribunal, led by Sarevok (which you might know from previous games in the Baldurs Gate franchise). Going down there will reveal a little of your true nature as one of Bhaal's chosen, and you can choose here to either sacrifice a companion to Sarevok or fight him instead.
The truth will come out as you finally make it to Orin herself. Orin reveals that you're basically her sibling, and she betrayed you and inserted a Mind Flayer worm into your skull.
The Red & The Blessing
You'll have to fight Orin one-on-one here, which isn't something that you had to do in your main Tav playthrough. You CAN have your companions attempt to help but if they do, then all of the cultists will jump you and you'll have to defeat them too.
Once you defeat her, you'll be asked by Bhaal himself to accept his blessing. If you do, then you receive the level nine spell Power Word: Kill, an extremely overpowered spell that you'll want to save for a critical moment later down the line. If you reject his gift, though, then you'll die.
But you live! Withers appears and allows you to continue on with your fight, saying that it isn't your time and you've proven yourself as being somebody pure of heart. As he resurrects you, he reveals that you no longer have the Dark Urge within you, and you'll no longer have to deal with him trying to make you do the darkest possible thing you can.