theres a quest called dark ranger round up where you are tasked with creating new dark rangers at the battle for darkshore. it basically establishes that the night elf forsaken feel abandoned by elune and are pissed off. they are where they want to be
Nathanos Blightcaller says: When the night elves lie dead at your feet, call on Brynja to raise them.
- A val’kyr accompanies you to raise the dead. Sometimes Angry Wisps emerge. If the slain night elf does not desire to be raised again, Brynja will say:
Brynja says: There are no willing souls nearby.
- When you raise a kaldorei dark ranger, Brynja will say:
Brynja says: Not even death can stop you now.
Brynja says: Rise, and serve once again.
Brynja says: Death calls you home.
Brynja says: You have been given another chance.
If the Lost Wisp is following you and Brynja is summoned, she will say:
Brynja says: It appears this lost soul wishes to follow you. Perhaps we should bring it back to Nathanos.
and then when sira and delarynn are raised they briefly have an exchange with tyrande
Tyrande Whisperwind says: You must fight the shadow in your hearts, sisters!
Sira Moonwarden says: We placed our faith in you.
Delaryn Summermoon says: And you abandoned us. Elune abandoned us!
Delaryn Summermoon says: We have nothing left. We are forsaken.
Tyrande Whisperwind says: Never again. Ash thoribas!
so the night elves that come back are vengeful. they wouldnt follow tyrande again. alliance arent getting a forsaken themed race and there arent even any among them