Brimstone is the one the RenFair puts on. I found it alright but being in the cart means actors can't scare you until it stops making it a bit repetitive and predictable. It had long stretches of nothing happening too. Haven't been in a few years though. Some of these haunts you can do in one night. Kings Island is about 30 min from Mt. Healthy and Dent is less than 20 min from Mt. Healthy. Lewisburg Haunted Cave is about an hour from Mt. Healthy but north and going away from Dent, also north is Land of Illusion at about 45 min. Both are some of the best haunts you will find anywhere. Depending on hours (Haunted Hall being all volunteer will probably have the fewest hours, 8 to 11 Fri and Sat, 7 to 9 Sun) you could chain a few parks together. If the math can work out going Dent -> Haunted Hall -> Land of Illusion or Lewisburg might work. Dent also has weekdays they are open.
Some descriptions that might help:
Dent: The most detailed and immersive scenes you will find anywhere, the sets are truly amazing and even a Kings Island Easter egg! The Phantom Theater stage is part of the haunt. Great actors and a decent length. They have a chain link maze that is ok but I would skip it for other haunts if I had limited time in the area. They have been voted best haunt in the nation and for good reason!
Lewisburg Haunted Cave: An actual cave and very long, the longest ever according to Guinness. The entrance area is my favorite of any haunt traveling over water in a dark cave with something lurking in the water! They have had to tone it down a bit due to fire codes but they have running cars and a fire wielding Satan. Tons of hand made animatronics and some clever gags make it unique compared to places like Kings Island that get those sort of things from companies. I've seen the same animatronics at a number of haunts before but Lewisburg keeps it unique. The actors here are very good as well, I've never left this haunt disappointed.
Land of Illusion: Several haunts in one but kinda expensive. Expect to pay for parking too. Very animatronic heavy and lacking actors in some of their houses. They get kinda "haunt in the box" for my tastes. But they have a large area with fire pits, games, bull ride, food and more. Unless lines are short an all night affair. The Middletown Haunted Trail is the highlight here with some nice animatronics (headless horseman) and pretty long. They have some good detail in some of the houses but others are more bare bones. They also have a small carnival ride they count as one of their houses. You can buy a combo ticket or per house. Check their website for deals.
Mt. Healthy Haunted Hall: A charity haunt benefiting a Boy Scout Troop, Knights of Columbus Council and the Mt. Healthy Food Alliance. Every year it must be torn down to free up our building so it changes every year. This will be our 32nd year (skipping one for covid) with this years unique theme being The Voyage of Fear. We don't have fancy animatronics so most of our sets and props are hand made. We have a giant Vortex tunnel (much bigger than you see elsewhere), Hellevator, and a dark maze for a finale. Decent length (around 20 min depending on how long the maze takes you) with our building, several army tents and a backyard trail. You'll be surprised at how good many of our actors are since many of them have been haunted since they were 11, but we do still have some youngins that may not scare you as much. Despite that I'm blown away every year with what some of them come up with! We tend to be very interactive too, many of our actors will act along with you. Bring a canned good for $3 off or on Sundays bring two cans of soup for half off, $6. We also have a coupon for our fist Friday and Saturday on Sept 30th and Oct 1st.
Terror Town: A western themed haunt with a special "extreme" option. I was lined up in a firing squad, hauled away with a sack over may head, had my head dunked in water, was drug across the ground and had copious amounts of blood dumped on me. You can opt out of course! But events like live (as in buried alive) burials, the firing squad and a hanging give you something cool to see while waiting. You can also explore the town which has actors, food and shops. They notify you by text when ready so be sure someone has a phone that will get service out there, not all do! This haunt is really cool but beware the effect the special band can give. I was the only one in my group with one so I got mauled at every scene while the rest of the group was kinda ignored. They do have good actors that interact as well. Not many animatronics if that's your thing.
Overall this area has a lot of Haunted Houses, real haunted places and some very good scares! If you couldn't tell I prefer the old school scares and clever scenes much more than high budgets and animatronics. But there is an excellent haunt within an hour for every taste.