My patch 3 campaign now brought me back to the blighted village well and the ettercap + phase spider battle.
Party was completely wiped out two times in a row now, by not being able to hit anything, except for Gale's magic missiles.
I'll retry a third time another time maybe. Pffffff...... (I already won this fight in earlier games, it's really rotten rolls here)
You can't really do much to prepare for this battle, the spiders are always in the advantage at the beginning.
And then continually missing with hit-probs between 56% and 75% is quite frustrating. A real-life DM would probably find some way to save the campaign.