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Find Dr. Raya Underhill in New Growth

If you searched “control resonant underhill”, you are looking for a missing Mold researcher in a side story, not a separate game. These notes cover how New Growth starts, which keys you pick up, and whether the last talk changes the loot.

Unofficial fan notes. Not affiliated with Remedy Entertainment, Annapurna, or the publishers of the game. No official logos, key art, or screenshots.

Spoiler warning. Quest names, item names, and a short start guide sit in the open text. The numbered route, specimen hunt, and the three ending options sit inside the marked sections below. Open those only if you want story beats.

This page was not played in-game. Every step is from dated guides, compared against each other. Facts the guides do not agree on are marked disputed or unverified.

How to start

New Growth is a Park side story. PowerPyx (fetched 5 October 2026) lists two starts after the main mission The Hedron Link:

  1. Finish Zoe’s Briefing in the Watchtower. PowerPyx says talking to Zoe can add New Growth to the log.
  2. Or go to the FBC rooftop base in The Park and talk to the staff by the fast-travel door. PowerPyx calls this a female soldier. GamesRadar, AllThingsHow, and Nerdschalk name a ranger called Busken.

PowerPyx’s Zoe’s Briefing page also says the quest can begin if you already picked up the Level 6 clearance card in The Park. GamesRadar (30 September 2026) says you start it only after the full main story. That disagrees with the trophy walkthroughs and is unverified here.

What you get

Guides that name a reward agree on one item: the Untapped Brass Dusters artifact recipe. GamesRadar describes the effect as +50% combat ability damage and no Falter. That effect text was not checked in-game.

GamesRadar also reports a Park zone-level increase. AllThingsHow reports a talent point and a power-upgrade pickup inside the lab. Those extras were not confirmed by PowerPyx’s New Growth page.

The Budding Mycologist trophy is disputed. PowerPyx’s New Growth and Carbon Copy pages both say you need this quest and the Carbon Copy chain. GameRant (22 September 2026, before launch) and AllThingsHow credit the trophy to New Growth alone. Until someone checks in-game, assume Carbon Copy is still required.

The last conversation, without the plot

GamesRadar (30 September 2026), GameRant, and AllThingsHow agree on the useful part: the last talk does not change the quest reward. Pick whichever line you prefer. The three options themselves are behind the spoiler block below.

Show the three ending options (spoilers)

Dated guides list three lines:

GamesRadar says Zoe later comments on the call, with no long-term mechanical change. This page has not replayed those scenes.

Keys to pick up

This is the part most long walkthroughs scatter. Order below is what PowerPyx, GameRant, and AllThingsHow share. Item names are spoilers of inventory, not of the ending.

Show the numbered route (spoilers)
  1. Talk to FBC staff at the Park rooftop base, by the fast-travel door.
  2. Search the small rooftop south of that door. Take the resignation letter and the Level 6 card from the desk.
  3. Fast travel to Oldest House: Central Executive. Open the clearance 6 office (PowerPyx: upstairs, then left; GameRant: second locked door on the left). Take the apartment key.
  4. Return to The Park. Clear Mold at the apartment building. PowerPyx: upper-right of the Park map, up one floor, first door on the left, kitchen. AllThingsHow (27 September 2026) prints the address 140 Fletcher Ave; no other dated page in this check repeated that number, so treat the street number as unverified.
  5. Talk to Dr. Underhill. Take the sewer-lab key from the counter.
  6. Enter the marked underground door. Turn left into the lab. Take the tracking equipment from the tables. Guides disagree on how many empty tubes sit there; grab what is on the desks and do not stop for a count.
  7. Drop past the railing, pulse the pale Mold when prompted, and follow the trails until three specimens are dead. Each drops a sample tube. Fire damage is the combat tip GameRant and AllThingsHow repeat (Inferno).
  8. Return to the apartment and finish the conversation.

Specimen hunt

AllThingsHow’s specimen page and controlresonant.guide (updated 3 October 2026) use the same three labels. PowerPyx is vaguer and points at map icons instead. Locations below are those two pages, not an in-game pin.

When a trail splits, those pages say the remaining order does not matter. PowerPyx says a cloud icon with an exclamation mark marks a subject on the map. Pulse control is reported as L1 / LB on AllThingsHow and controlresonant.guide; this page did not capture the PC binding.

AllThingsHow mentions Assist Mode one-hit kills as an optional setting for Specimen A. That is a menu option, not a required step.

What this page will not claim

FAQ

Is Underhill a separate game?

No. Searchers looking for “control resonant underhill” are looking for Dr. Raya Underhill, an NPC in the New Growth side story. The game itself is Remedy Entertainment’s CONTROL Resonant, released 24 September 2026 on PlayStation 5, Xbox Series, and PC.

How do I start New Growth?

Trophy walkthroughs list two starts after the main mission The Hedron Link: talk to Zoe in the Watchtower (Zoe’s Briefing), or talk to FBC staff on the Park rooftop base. PowerPyx also notes the quest can begin if you pick up the Level 6 clearance card in The Park first. GamesRadar’s claim that you must finish the whole main story first disagrees with those pages and is treated as unverified here.

Does reporting Underhill change the reward?

Dated guides agree the last conversation does not change the quest reward. GamesRadar, GameRant, and AllThingsHow all say you still get the Brass Dusters artifact recipe either way. GamesRadar also reports a Park zone-level increase. This page has not replayed the endings in-game.

Does New Growth unlock Budding Mycologist by itself?

Disputed. PowerPyx’s trophy pages say you need New Growth and the full Carbon Copy chain. GameRant and AllThingsHow credit the trophy to New Growth alone. Until an in-game check, treat Carbon Copy as required.

Sources used on 5 October 2026

Primary in-game capture: none. If a later pass plays the quest, upgrade disputed rows instead of copying a new press page.