Tainted Grail honestly would probably be the closest feeling to a Bethesda game. I've played it, and it's really fun. The magic feels good, but the two-handed fighting feels best imo, super beefy. It's not quite as open as a Bethesda game, but there are plenty of choices, things to do and collect/craft, all kinds of little side quests to give you a good view into what life is like on the island.
Another person brought up Lantern of the Laughless Saint, which is currently in development and I don't think there's a demo yet or if there will be. It does look pretty fun though.
There's also Sword Hero which is also in development by a single dev, but there's a playable demo on steam and it's looking like it's gonna be pretty big. There's directional physics-based combat, where if you turn your camera into the swing of your weapon you'll do more damage, and you can target individual limbs; I believe it'll have a semi-persistent world where people will remember if you've pissed them off before; it has Kenshi-like lore, where they live on a ringworld that has advanced technology around the place like automated medics and prosthetic limbs (there is dismemberment and you can lose your limbs); dragons and other fantasy monsters. Honestly it looks like it might be my next most anticipated game.
Edit: there's also GreedFall by Spiders (which just went under, so who knows how long their games will stay listed) and I really liked it. It's third-person, and it plays a bit more like a mix between Dragon Age: Inquisition and a third-person hack-n-slash, but I got really drawn into the world and story as imo it just felt incredibly unique and something I hadn't really experienced before.
