I spent half an hour on that fight, did pretty well too (especially with three characters, as Wyll slept through it, as usual), dispensed with its minions, got it down to about ¼ health... at which point it basically said "I'm bored, imma pwn you all now", took out my two main hitters reducing them to a non-revivable state leaving my archer stranded on a pillar of rock wondering what to do with herself. Grr etc. Okay, maybe if I'd persisted I could have persevered, but half an hour of listening to battle music was more than enough for me.
Use one character to start the fight while the others hide.
Use your wizard to take down the 3 egg clusters with fire bolts away from the fight. He wont aggro and you can kill them all while all the enemies are stuck in turn attack mode.
Use the rest of your party to go behind one of the spiders (the one below is the easiest to reach. Bring your three characters to surprise hit one of the phase spiders. This should kill him before the spiders can attack.
Use your wizard to firebolt the webs if the Matriarch is standing over them. With 1 hit they are destroyed and she falls to 30-40 damage. More often she jumps to a new web so repeat the process at least 1 more time.
Congrats now you only have to kill 1 phase spider and a matriarch at 40 health at most. With your entire group still ready to strike.
