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I notices spiders were immune to entangle spell which is not right. They are immune to webs and entangle is much, much different.

Ha! You were killed while facing the goddess in the south-western cave, close to the beginning!

I didn't trust them at all, bastards who were watching me get killed by a bunch of undead.

This is not about this dungeon, but now that you mentioned it, I managed to kill the trap with undead and spiders. Then I had to come back later for other fights and I beat the spider queen and her spiders at lvl 5.

Re/ entangle immunity, it's a house rule. The game doesn't record immunity to every small thing/spell, so here it's immunity to hampering, same effect as obtained with freedom of movement.