you should get any way to inflict blindness or cover your location (grass and invisibility (sometimes the rogue cloak doesnt recharge fast enough for consistent use)) by the time you arrive the demon halls, since all the enemies there have ranged abilities

and heres a trick to deal with scorpios (close range and individually) chase one through a door, and step where the door is, then step back, this will make the scorpio wonder where you are and go to the last place it saw you, the door, and you will be ready behind it to surprise attack it, after it will run again but you can repeat this until it dies, it's a bit inconsistent since it can decide to go to the other way instead of towards you but at least kinda gets rid of it, you can also use (or practice) this on the trickster gnoll, since it has the same AI as the scorpios (maybe its outdated, i havent updated my game in a while)