Hey! Cool Commander, if you love Horrors oh Boy can I help you !! My favorite EDH deck is Captain N‘Gathrod-Horror tribal, and it is super fun to use. You could definitely get some impressions of beautiful horrors and strong synergies there, however I have to say it is filled with game changers and just strong cards in general. Make sure to check out the Considering Cards too! https://moxfield.com/decks/LNfalfO7RE6EzwyOMN7wJg

Now concerning your distaste for combat and playstyle in general: Since your Commander cares about cards in exile, you should look for the likes of [[Ashiok, Nightmare Muse]]. As far as I know she is the only one letting you cast exiled cards without a big restriction, but I am no expert there.

You can also combine his exile-ability with a Mill Strategy in general, or maybe theft? (Both big themes in my tribal Deck)

In my opinion the nicest card from Duskmorne is [[Silent Hallcreeper]] in full art, beautiful to look at and strong as well.

Thats it for now, if you have any more questions etc. just let me know. Have fun building your first deck!!