According to the torturer in the goblin camp the Absolute is searching for a weapon
I think the weapon is YOU, the MC, and your party of "special" people. Some have argued that none of the companions are normal, regular people. I think there's a reason for it. I think the entire party was "Chosen" by the Absolute for a reason. They are like a collective. Magic Pockets, shared thoughts, even if a party member isn't present, they know what you've said and pass judgment on your decisions. At one point, Shadowheart tells you that a voice in her head called her a "Beautiful Weapon." The goblins who enter the secret tunnels with Findal the Gnome Druid were sent to search for "a weapon". Ed's siblings tell you that they were sent, along with many others, to search for survivors from the crash. They are looking to gather all the True Souls.
Then, if you choose to use Illithid powers, the Dream Lover shows up and calls you Chosen. So, I think it's pretty clear that YOU and your companions are the weapon. You are one collective unit that the Absolute is hoping She can use in some special way.
I don't know. I could be totally wrong, but it sounds a lot like Mellisan in BG2 TOB. Who did she manipulate and use to fulfill her purpose? YOU, the player, the most powerful of all Bhaalspawn who was, from birth, infected with some sort of strange, other-worldly powers. Who is the Absolute using? YOU, the player, someone infected with some sort of strange, other-worldly powers.
