This quest The Calm Before The Storm starts in the middle of Nameless in Witcher 3.
You play as Ciri again as you re-live what had happened before the Wild Hunt attack.
Here’s a walkthrough of The Calm Before The Storm in Witcher 3.
Follow Astrid to the sauna
After waking up, you need to follow Astrid all the way to the sauna to have a hot bath.
You can use the changing room to undress and head to the bath area.
Jump into the water
You can regenerate a majority of your health if you jump into the water.
Drink a shot of Firewater
Once you’re done, get up and drink a shot of Firewater. It will boost your health even further.
Join Skjall in the stable
When you’re done, head back. You need to get your clothes first.
Meet Skjall in the stable.
Try to defeat the Wild Hunt warriors
The Wild Hunt appears and you have to fight them. Try to defeat the warriors.
After some time, your objective is to grab a horse and leave the area. Head to the stable to trigger the cutscene.
Make it to Drowned Dead Rock
Together with Skjall, keep riding until you reach the destination. There’ll be Wild Hunt creatures trying to attack you.
The quest ends as you reach the destination.