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My educated and totally not just guesses on the choices:
-Talos workshop null tech
NULL TECH (duh). Maybe the secrets of pylons and null generators tech style rather than biological pariah gene
-The infirarmy
Some sort of augment or survivability upgrade. Very very tempting. Also one of our major goals
-The Command Throne
AWAKEN, MACHINE SPIRIT OF THE BLACKSTONE FORTRESS.
Having a definitely-not-an-AI-but-a-machine-spirit of the Blackstone Fortress would be very useful for unlocking necron research, strengthening the power of the blackstone fortress and maybe even diplomacy.
We also have a new friend to talk with. And maybe UR025 won't be as mad for us massacring the original warp spirit of the blackstone fortress if we ever meet him...or want to meet him.