Couple of other things which might be useful in this thread -
Timelines: some people (me included) are wrestling with the overall timeline of events in HoD and have drafted timelines we are planning to use, over on reddit: https://www.reddit.com/r/alienrpg/comme ... _timeline/ - still work to do on those, feedback welcome.
Working Joes: HoD clearly has many influences, Alien Isolation (the computer game) being one of them. I've not yet finished playing through that, but the Working Joes from there can clearly be some of the most engaging threats that the PCs in HoD, if the GM chooses. I found this video useful for how Working Joes speak (if you're not familiar with the game), and how they can interact, threaten or offer to assist PCs. The quirkiness of them really is worth including, I think! https://www.youtube.com/watch?v=zIVgMddH66o, though this useful fansite, suggests the W-Y Davis Model correction androids are cosmetically similar but display more intelligence than Working Joes: https://avp.fandom.com/wiki/Davis_(model)
There is a list of all these stock phrases used in the game - I've stolen and adapted a few that i'll seed in conversations when they first meet and especially as things inevitably turn sour... (amending the references from APOLLO, Sevastapol and Seegson as necessary) https://avp.fandom.com/wiki/Working_Joe#Quotes