IMO the placement of Spider's Bane sword is inappropriate. It is placed after the heavily infested spider area in Cloakwood. That sword should be before this area. This area is a difficulty spike due to one of the most powerful trap in the game - Web.
It was terrible experience to watch how a single phase spider killed 3 of my party npcs. A trap triggered and immobilized 3 characters. The other 3 escaped. But then the phase spider attacked the trapped ones and I couldn't dare push the other 3 npcs to help them. I knew if they enter the Web to help, they will die too so I had to watch from a safe distance how this nasty spider killed all 3 npcs slowly and agonizing. Finally the spider still hungry came to attack the remaining npcs and of course got slaughtered. I took their remains and went back to the temple to ressurect them. It was pain to order my npcs to leave those in need of help and just leave them to their doom.
Why this trapped trigger ? I sent Coran to scout that area, why didn't he spot the trap with 65 Detect Trap ? He detects some traps there and completely misses other traps. Sometimes he arbitrarily turns off detect mode when he enters stealth mode. Something is wrong with his AI behaviour.