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Baldur’s Gate 3is a game about decision and consequence, rewarding those who go the extra mile to stop their busy adventuring to help people in need - people like Thulla the Deep Gnome. A slave who ran away with a very valuable item, she’s gravely wounded and in desperate need of medical attention.
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Should you so choose to help this poor soul and brave the Underdark to find her cure, you’ll definitely reap the rewards. If you’re crafty, you could potentially even fulfil several quests at once, and what’s better than an adventurer? An efficient adventurer.
How To Find Thulla
Thulla is found injured and lyingon the ground in front of Sovereign Spaw in the Myconid Colonyin the Underdark (Coordinates: X: 83, Y: -97). They’re both at the center of the colonyat its highest point,reachable by climbing the mushrooms.
You’ll need to enter the colony peacefully and at the sovereign’s beckoning to speak with her.Ask what’s wrong with her,and you’ll be told about the Duergar Poison.

From here, there area few options:
If you successfully investigate Thulla, you’ll notice she has a pair ofnice boots, and rather than helping her, you can forcefully take them and end the quest here. Additionally, you can take those boots to the Duergar of the Decrepit Village to earn their favor.
Ask Thulla how she ended up this wayto be granted an opportunity for aMedicine check.Upon a successful Medicine check, you’ll learn that there’san Antidote, but other “natural remedies” may workas well.

There areseveral ways to cure Thullaof her poison, but the best ways to do so boil down tothree solid methods:
The first two will see immediate results. She’ll thank you and give you herSpeedy Boots as a rewardwhich grant the Bonus Action “Click Heels” (a free Bonus Action Dash).

If you may’t heal her with magic, the easiest solution is tofind the antidote.
Taking a Long Rest or leaving the Underdark while Thulla has not been treated will sometimes result in Thulla being deceased when you return so long as you’ve met her character.

How To Find The Duergar Antidote
The Duergar Antidote lies further in the Underdark at theDecrepit Village. It’s infested with invisible Duergar Slavers, one of which(Gekh Coal) holds the antidoteyou’re looking for.
As getting through this village ofinvisible dwarvesto the one who holds the antidote so you can pickpocket it is out of the question for all but the bravest (and most foolish) of souls, the most straightforward option is tobegin combat with them.

There arefour Duergar Slaversin the village. Three of them (all except Gekh himself) have theability to cast the spell Invisibility.
you may make this fight a 5v4 byrecruiting Sovereign Glutat the Myconid Colony to temporarily join your team. However, this does trigger its own quest where you will have to decide, after killing the Duergar, whether you wish to return and kill Sovereign Spaw at the Myconid Colony, overthrowing him, or side with the Myconids and kill the traitorous Glut.

If you have no interest in killing Sovereign Spaw and betraying the colony, then Glut makes a useful damage sponge.
The best strategy here is tosneak up on the area and begin attacking Gekh Coalwith ranged attacks (especially ranged Sneak Attacks). Assign all but one of your party to attack Gekh while theremaining person enters the house to deal with Holvik.

Lurgan will appear on the second turnto attack your people, but he’s best dealt with after Gekh Coal. You’ll sacrifice a hit or a potential cast of Silence in return for dealing with the most dangerous man here.
For extra damage, try using the “Shove” Bonus Action. A fall from the second level to the ground generally deals 2d10 damage.
With Gekh Coal gone on either the second or third round of combat, you’re able to nowbegin to focus on Lurganwhile the single party member still dances with Holvik. Novice Garmor takes a long time to reach the battle at the top of the village, so he’s hardly worth the concern.
Thereanimated corpses, if they’ve been brought back, are not much concern either.If they’re brought back, focus on targeting the person who summoned them (unless it’s Novice Garmor). Killing that person or knocking out their Concentration will render the summon useless. Alternatively, a Cleric can use Turn Undead to send them away.
Using height to your advantage,you may make short work of Garmor once he’s finally made it up there. He typicallyuses Rage when he reaches you,so it’s a good idea to have atank holding him on the second levelwhile yourranged supports fire down from the third level.
If you can’t kill him in one turn, you can alwaystry Shoving him over the edgeto have him waste his movement climbing back up and repeat the process until he dies.
You’ll be able to finallyturn your sights on Holvik,if he’s still alive. If you’re having trouble with him,use magical arrows on the boxes where he likes to stand.He’ll be forced to move to avoid taking area damage, negating his usual height advantage.
Wrap up the fight, and then you canstart looting corpses.Only two have real loot worth taking.
Lurgan
Take the antidote back to Thullato cure her. After, she’ll thank you and give you those nifty boots.
Additionally, you cantell Sovereign Spawthat you’ve cleansed the Decrepit Village of the Duergar presence for that wonderful multitasking prerogative.