The Chimerist's Last Experiment is one of the Faction Quests in The Outer Worlds. Faction Quests are optional quests that players can chose to complete in order to obtain special rewards, XP, and reputation with a given Faction.
The evidence you found in Cascadia and on HRS-1084 convinced Lilya Hagen that Dr. Eva Chartrand is at the center of an alien invasion conspiracy. She wants Chartrand killed for the good of humanity.
Chartrand is a Board-sponsored Chimerist - a scientist who manipulates the nuclein of plants and creatures from Earth to survive on colony worlds.
The Chimerist's Last Experiment Objectives
- Find and Kill Eva Chartrand
Eva Chartrand's home is on Byzantium. Lilya gave you a keycard to the front door.
- Return to Lilya Hagen
Lilya will want to know what happened at Dr. Chartrand's estate. She can be found at SubLight Headquarters on the Groundbreaker.
The Chimerist's Last Experiment Walkthrough
Head to Dr. Chartrand's house in Byzantium within the Estate District and use the Byzantium Estate Key to open the door and enter Dr. Chartrand's Home. Once inside, use the terminal to read her logs and notes, some of which talk about you checking the lab terminal on Cascadia and your takeover of HS-1084. Use the same terminal to open the lab and head down the elevator. Head forward and speak to Dr. Eva Chartrand. You can tell her that Lilya Hagen sent you to kill her, and she will say she does not know Lilya (if you bring her up) or wonder if you were sent by The Board. You can Lie (1) to her to get her to tell you what she is doing, which is finding a new way to feed the colony, as the crops that humanity brought from Earth are not reacting well to the local soil and are not giving humans the needed nutrients to survive. She will tell you that the colony will starve unless she can alter humans to thrive on the nutrients found in Halcyon, and will try to dissuade your fears that there is any alien takeover if you bring it up. She will also reveal that they didn't want to experiment on unwilling humans, so they instead experimented on each other, and will bring up the concerning fact that they contacted Earth about this years ago and never heard back.
Important: You need to be on decent standing with The Board or you won't be able to persuade the guards to let her go. If you're falling into aggro or don't get options, go do some quests for The Board and come back later.
Ask her to work with Phineas Welles:
You can tell her to work with Phineas Welles, and she will agree and you'll gain 15000 XP and gain Negative Reputation with The Board. You'll have to convince the guard not to attack you as well by mentioning Sophia, Persuading him (100) or bribe with 2673 bits. When you return to Lilya Hagen you'll gain Negative Reputation with SubLight Salvage & Shipping and 35000xp. Phineas Welles will make no mention of Dr. Chartrand, however.
Ask her to work with The Board:
You can tell her to work with The Board, and she will agree and you'll gain 15000 XP and gain Positive Reputation with The Board. You'll have to convince the guard not to attack you as well. When you return to Lilya Hagen you'll gain Negative Reputation with SubLight Salvage & Shipping and 35000xp.
You can also kill her, which will net you negative reputation with The Board. Travel back to the Groundbreaker, speak to Lilya, and get 15000xp, 20000xp, 2188 Bit Cartridge, SubLight VP Armor, and a promotion to "Vice President of Aggressive Acquisitions".
When you travel back to your ship you'll find SubLight Salvage Poster, and potentially a hand-written letter from Catherine Malin.
The Chimerist's Last Experiment Rewards
Unlocks quest: None
Other Rewards: SubLight to the End Trophy / Achievement, 35000-20000xp, 2188 Bit Cartridge. Reputation varies per choice.