the quest has 6 person recommendation . at first glance it seems impossible to solo it. you need someone as decoy while the other retrieve the document then change role.
i would like to give some tip on how players can solo this quest.
Force Master Solo Intel
Go to South of Crimson Base
Climb the Tree and Windwalk in their center Camp
Inside the Camp:
Use Frost Step to Enter Frost Stance
Turn your back and Use Ice Armor and wait for the npc to attack you
Deactivate armor – this will make the melee npc frozen and be able to backstep enough to reach the document.
After Ice armor, use divine veil to resist the ranged npc attacks.
Retrieve the Documents.