One of the first quests you'll come across in Baldur's Gate 3 will come from Lae'zel, if you recruited her to your team. One of the Tieflings you saved her from was clearly aware of Githyanki, and so Lae'zel is convinced there must be a creche nearby.
With Lae'zel adamant that someone at the creche will be able to remove your little parasite, you can choose to follow this lead down. Here's what you need to know about the 'Find the Githyanki Creche' quest.
How To Find Zorru
Your first stop is to head to the Tiefling camp and speak to Zorru, the person who was familiar with the Githyanki. You can find the entrance to the camp at (X: 208, Y:436). If you haven't been there before, you'll have to help the locals defend against some Goblins before you can get in.
You can find Zorru near (X:204, Y:572). You'll need to have Lae'zel in your party with you when you speak with him to progress the quest.
How To Find The Githyanki Patrol
You'll want to head to the Mountain Pass to the northwest of the Emerald Grove.
Along the way, you might encounter a dying Edowin, Scratch the dog, and likely pass through the Blighted Village.
At around (X:-89, Y:539), you'll see a glimpse of your first Githyanki, or at least the shadow of their dragon on the ground.
Head further into the pass, and at about (X:-112, Y:531), you'll see a cutscene of a group of Githyanki clashing with some soldiers. Afterward, Lae'zel will approach and speak to them. The little meeting doesn't exactly go as planned, and it's best to convince Lae'zel to play along.
If at any point you reveal you were aboard the Nautiloid or that you have the artefact, the Githyanki will attack you.
If you kill them all, you can loot their bodies to learn where the Creche is by examining the Elaborate Plate you find on them.
How To Enter The Githyanki Creche
Head to (X:-176, Y:541) to enter the Mountain Pass.
Be warned that the Mountain Pass is a lot more difficult in level, and you will be prompted to tie up any loose ends before continuing.
At around (X:-68, Y:-54), Lae'zel will identify some creche markings. You're heading for the Rosymorn Monastery, so summon the cable cart at (X: -46, Y:-73). You'll need to pass a Strength check, and take it over to the other side and follow the path down to (X:63, Y:13) where you'll see a cutscene of some Githyanki and some prisoners.
You can use Speak with the Dead to talk to Corliss, the prisoner who was killed to find out more about the Absolute.
The doors to the creche are locked, so you'll need to find another way in. To the left of the door, at (X:66, Y:32), you'll find some broken windows — climb in through here.
Inside are some drunk Kobolds, so you'll either have to sneak past them or defeat them. After you've defeated them, head through the rear exit at (X:38, Y:50), jump across the gap and climb up the rocks.
Be careful, as there are many barrels around that will explode if hit, and the Kobolds will use these to their advantage.
At the top, look southeast and jump over to where the pool of water is, then break down the wooden panelling to enter the monastery.
You can find the Blood of Lathander nearby, so check out our full quest on this here.
Make your way down to the ground floor and head through the door at (X:91, Y:50), go across to the far side and enter the Monastery Basement at (X:75, Y:80) to find the creche.
You'll be stopped by the Githyanki, but choose 'Allow Lae'zel to answer.' This will open up the creche to you, and you can head to the infirmary to try and get rid of your parasite.