Alexi's Gambit (quest)

Objectives
Place the Gambit in the Viewing Room and slay Vectus and Marduk. Provided item:
 * slain
 * slain
 * Alexi's Gambit

Description
I require your assistance,. Find the undead mage Vectus and the warrior Marduk deep within here. They run the scourge's plagued dragon operation and must be destroyed.

Place this Gambit in the viewing room where they are located. Hopefully, it will react with their forces and utterly destroy them!

Oh, defeating Vectus and Marduk afterward shouldn't be a problem. Right?

Rewards
You will receive:

Progress
Are they defeated?

Completion
You did it! They are defeated! And the Gambit... did it work?

Very interesting. You've done well,.