Hollow Investigative Association

The Hollow Investigative Association (HIA) is an organization affiliated with the New Eridu City Administration, and a faction in Zenless Zone Zero. Hollow Survival Guide They are primarily responsible for containing and researching the Hollows. Investigators regularly complete official commissions such as rescues and Ethereal hunts. Unlike Proxies, the investigators of the Association are legally accredited by the city administration.
The HIA recruits many individuals with high Ether aptitude to complete risky work. The HIA Career Club allows prospective investigators to compete in combat simulations and judge whether or not they are field-ready.
The HIA is also in charge of operating Scott Outpost, where they direct the containment of Hollow Zero.
== Ranks ==
The promotion path for Investigators is:
# Trainee Investigator
# Full Investigator
# Senior Investigator
# Elite Investigator
# Ace Investigator
With each promotion, an investigator shall face more pressure and danger, resulting in few being able to make it to the top and become an Ace. 
HIA recruits without high Ether aptitude are unable to advance far, and are usually relegated to doing office or logistical work. Meanwhile, many less capable investigators perish in the Hollow, or are left unable to work from the long-term effects of Ether corruption. 
==References==
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