If you just have the core set, and want more adventure, then "The Collector" is for you. The Collector is a fan-made scenario that requires only the custom cards provided in this PDF, and a single core set.
Print these 3 pages at 100%. Cut, fold and sleeve them in standard card protectors. Gather your Arkham Horror core set cards and you're ready to play. Instructions for setup are on the back of the "Scenario" card.
All suggestions and corrections gratefully received.
Cards based off of the amazing templates from Vardaen (https://boardgamegeek.com/user/Vardaen
UPDATED: More tweaks from suggestions in the forum thread.
Related forum thread: https://boardgamegeek.com/thread/1698105/collector-fan-made-...