Yeah combat in a horror game is fine, but you will need to toss out the CR system. Bump it up a couple of notches and run combat encounters with multiple different types of monster and make extensive use of conditions, especially things like paralyzed and restrained. I'd design the encounters to be resource draining and I'd manipulate the narrative to make the 15 minute workday impossible and to make rests at least complicated (although this sucks when you have a SR dependant PC). I'd also find a way to use the exhaustion rules quite a bit. You can use various types of mind control as a device to limit deadly combat if you want too. If the PCs know that the 'bad guy' is actually a good guy that they need to save it changes the whole dynamic of combat.
As I mentioned in my post above, encounter design with multiple non-compatible choices about outcome is also a good horror design tool for D&D. Most parties are used to having things go their way, and encounter design can take that away without having to change the core rules any. Feels like horror with no major rules hacks.
As I mentioned in my post above, encounter design with multiple non-compatible choices about outcome is also a good horror design tool for D&D. Most parties are used to having things go their way, and encounter design can take that away without having to change the core rules any. Feels like horror with no major rules hacks.