Spoilers for some side quests and the penultimate main quest. This is what happens when you complete all the optional side quests in preparation for the final one. You also unlock a trophy.

These are the required quests that impact this quest and the trophy:
A Moment’s Peace
A Daughter’s Vengeance
Sun and Shadow
Honor the Fallen
Sunstone Rock
Traitor’s Bounty
Queen’s Gambit
Hunting for the Lodge
Hunter’s Blind
Deadliest Game
Redmaw

I completed every side-quest in the game before this quest, bar Acquired Taste which I completed afterwards, and It seems some other characters should have shown up too but didn't for some reason. These are the allies that showed up:
Petra
Janeva
Nakoa
Teb
Vanesha
Uthid
Talanah
Varl
Erend
Sona

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