Among other things, there are NPCs which are either directly based on or inspired by NPCs from Daggerfall.
For example, here's one of the main quest-givers, originally "played" by a male mage from Daggerfall in Siege Breaker (as shown here). In the background is a mural depicting him casting a spell, in a way that should be quite familiar to Daggerfall players:
![Image](https://i.imgur.com/prSVIdA.png)
And here are NPCs in a friendly town, based on DF flats:
![Image](https://i.imgur.com/aaFVARR.png)
![Image](https://i.imgur.com/x6hvCtJ.png)
![Image](https://i.imgur.com/YFvvctd.png)
A female townsperson walking around -- not an exact copy of DF commoners but based on the same concept (I'd say she has a Victorian air about her though). The animation is impeccable.
![Image](https://i.imgur.com/PIFc0yR.png)
Some farm workers, these don't seem to be directly based on DF sprites but you get the idea.
![Image](https://i.imgur.com/goy0NoN.png)
Besides this stuff, which is purely cool IMO, the game plays well too, at least if you're into FPS gameplay with a mix of modern weapons (but you can also choose to play as a knight guy with sword, shield and bow) and fantasy plus some role-playing elements, a good helping of exploration and secret-hunting, and some innovative mechanics.