Your a pathfinder.

After taking some time in Layer 2: The Eternal Gale, you had spoken with a frankly strange woman who was experimenting on a random injured man to heal him with her blood.. How strange.

*But after lighthooking out of the Eternal Gale and exiting Schypozia you had went to the songseeker wilds and decided to take a break in the Derelict Highchurch you found her again!... And she can tell you hadn't drank the vial of heartstar solvent. *

"Your shitting me right? Here I thought you need teaching for Bloodrend but you just put a cap in the vial and went your merry way? I gave it to you for a reason, it ain't a plant fertilizer. Drink it. There's no reason not too."

Vyrelda says crossing her arms and plopping down in one of the pew's with a leg over the other, staring at you and waiting for your hand to take out the vial, chug the drink, get some probably internal pain and learn some Bloodrend from her.