The United Colonies Vanguard questline in Starfield features several crucial choice points that test a player's problem-solving skills and moral preferences. During the Delivering Devils quest, players must find Dr. Percival Walker on Mars to analyze a critical Terrormorph sample. However, locating the doctor requires settling his massive debt with the Trade Authority first. Players can choose between paying off the debt, altering the computer records, or completing a unique research project in the Deep Mines.
Paying the Full Debt vs Altering System Records
The most straightforward method to clear Percival's debt is paying the Trade Authority outright. The debt totals over 21,000 credits, making this option quick but incredibly costly for early-game players. Unless money is no object, handing over such a large sum yields no special bonus rewards or unique quest progression.
Alternatively, players with lockpicking skills can sneak into the Trade Authority office in Cydonia to hack the terminal. By using an override tool on the computer system, you can reduce Percival's remaining balance to a mere fraction of the original price. While this approach saves credits and grants extra experience towards Security challenges, it requires careful stealth to avoid getting caught.
Clearing the Deep Mines and Completing the Research
The most rewarding option involves traveling to the abandoned Deep Mines on Mars to eliminate the Spacer infestation. Inside the facility, you can assist Cambridge Cooper by gathering an Aqueous Hematite sample and processing it through the local lab equipment. Finishing this pharmaceutical formula allows you to sell the valuable research data directly to the Trade Authority to wipe out the debt completely.
Choosing this path provides the best balance of combat action, useful resources, and story immersion. Eliminating Spacers rewards plenty of experience and weapons, while discovering the research formula opens up new dialogue choices later on. Taking the time to finish the research is widely considered the optimal choice for players looking to gain maximum benefits from the quest.
Finding Dr. Percival Walker and Final Quest Outcomes
Once Percival's debt is settled through any of the three methods, Lou the bartender reveals his secret location in the lower levels. Navigating through the drill tunnels leads directly to Dr. Walker's hidden laboratory. Handing over the Terrormorph sample triggers the next major step in the UC Vanguard campaign.
Regardless of how you handle the debt, the ultimate quest outcome remains stable without penalizing your standing with faction members. Players still unlock the subsequent quest, Eyewitness, while receiving credits and faction progress. Selecting the research path simply ensures you retain your credits while maximizing combat loot along the way.