Easter egg contest:
https://steamcommunity.com/games/620590/announcements/detail/1651012249539260411
I think it's noteworthy to highlight what Warhorse is doing here. They're cooperating with Destructive Creations (developers of such games as Hatred, and IS Defence, yes, you read that right) on their new game Ancestors Legacy.
DC is pushing Ancestors as "historically accurate", just as KCD did, but a little research from journalists quickly brought to light that this amounts to one of their team being a "total history freak" and talking to a bunch of LARPers.
Looking at their track record I certainly wouldn't trust them with something like that, yet Warhorse is giving them legitimacy with something like this.