A guide to random tools for running and playing in Ravenloft and other horror-based D&D adventures.
Disclaimer: I'm an affiliate for DM's Guild
For encounter ideas I have encounters in shadowfell terrain
For new ideas try 100 new darklords and domains.
You might find a use for a deck of Tarot Cards
Curse of Strahd is the best-known vampire adventure for fifth edition
For random tables in pdf format there is a DM's Guild collection of extra encounters for curse of Strahd
Next are a series of random tables for gothic horror - Ravenloft Tables
I'll keep this guide updated so please suggest D&D generators in the comments or over at the rpg_generators subreddit