Quest: Altruis
ID: 10640

Quest: Altruis
ID: 10689

When you complete either of these(aldor/scryer), the demon hunter should say this:

"The information you seek... I cannot give you that freely. You will have to prove that your enemies are the same as mine."

https://youtu.be/WrQstA_rwc0?t=77
https://www.youtube.com/watch?v=UhvwQ_HqQC0
https://www.youtube.com/watch?v=4tLDDZuUsTk