I've never been able to say no to a man with a dangerous alien biosphere.

–Raya Underhill

Raya Underhill is a Threshold specialist under contract at the Federal Bureau of Control. At the request of Dr. Casper Darling, she was brought in to study and resolve the extra-dimensional Mold problem that had been plaguing the Oldest House.


Early lifeEdit

Underhill was hired by the Bureau as soon as she graduated from university. She specialized in Threshold research and regulation, but after a decade, she had grown frustrated with the way the Bureau was ran.

Underhill subsequently left the Bureau to become a professor, though the experience ultimately was not very different. Over the years, she stayed in touch with Darling, whom she ocassionally encountered at conferences and other such events. When he contacted her regarding the Mold, she was immediately fascinated and returned to work at the Oldest House once more.

Studying the MoldEdit

Underhill's research into the Mold led her to conclude that it was both durable and extraordinarily prolific, tempting humans into consuming it so that it could use their bodies as hosts and spread even farther. This led to some friction within the department, as some researchers, such as Abraham Lewis, believed she was presenting the Mold case as more complex than it actually was for financing reasons. Even so, Underhill remained fiercely convinced of the Mold's potential, arguing that it could even outstrip Black Rock in terms of usefulness if more research went into how it could be applied.

On the 29th of October 2019, about four months after Underhill first began studying the Mold, the Hiss invaded the Oldest House. However, due to the Hedron Resonance Amplifier given to her by Darling and her workspace on the edge of the Mold Threshold being somewhat removed, Underhill was relatively safe from any direct attack. Nevertheless, the invasion prevented her team from keeping the Mold's spread throughout the rest of the Oldest House under control and left it understaffed to carry out more expeditions into the Threshold.

Upon meeting Jesse Faden, the new Director, Underhill tasked her with collecting samples of several Mold strains that, when combined, would make one immune to the fungus' toxic spores. In this way, she hoped to send someone deep into the Threshold to find the source of the Mold and figure out how to stop it from spreading even further. Once Jesse returned with the samples, Underhill was able to synthesize a pill, following which she sent Jesse to find Mold-1.

Later, Underhill was aghast to learn that Jesse had killed Mold-1, but a sample from the creature did placate her to an extent. She informed Jesse that Mold-1's demise had brought a halt to the Mold's rapid spread. In the mean time, however, several infected Hosts had managed to escape the Threshold and begun roaming the Research Sector. Underhill subsequently tasked Jesse with eradicating these as well, to ensure the Mold's proliferation was definitively stopped.

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