In BG2 how hard Underdark is depends a lot on whether you explored other areas outside of Amn before going to the crazy house or not. I usually finished everything i could before getting to the Underdark so i would just rofl stomp through it. The Illithids were the only ones giving me a lot of trouble at first because i was low on tinfoil. Luckily Boo went for the eyes really good. And then later i made sure to stock on tinfoil and psycho potions in advance.
In this Underdark, i thought to experiment with the fire bolts safety system at the gate, so i kept trying to lure the Minotaurs to the gate and then close the gate and turn on the firebolts. But, by the time i managed to get a minotaur close enough without dying, the bolts didnt work anymore. And i even turned on all the lights i could around the big jewel on the statue thinking it may make it stronger. The jewel even starting showing animation of two beams connecting to the rubies up in the gate itself - which it didnt do when i just got there, But, it wasnt firing anymore. Cue Minotaurs jumping to the side of the gate and mayhem inside.
Only had to revive one or two comrades. Depending on the reload...
But then a funny thing happened later on, because i didnt go the the shroom village, but instead went exploring. And i saw this cool looking big glowing tree... so, I got Shade to cast that group sneaking spell and we went in sneaking. Mostly because the Bullet train past through us a few times already so i was expecting it to surprise us again at any time. So were sneaking in around the big glowing tree - AND THERE is the Bullet coming from behind suddenly... but it misses all of us, and it doesnt see us either.
So its just like turning around, while we are watching it. And then i thought, it would be cool if i could get the lone HookHorror to join in, maybe they will attack each other. But i couldn't catch it and draw it in and Bullet disappeared into the ground.
Drats i say and we continue. We see a few more Hooks chirping on the branches And i figure out we can climb onto the branches too. So we go up, i start a fight, and then the Bullet comes blasting in again, but under us down on the ground. And then all the Hooks jumped down on it and a glorious free for all everyone against everyone ensued.
Smack, bing, bong, wooosh, slam, shbang, dingity dang.
There is a problem with pathfinding on those branches, one character just fell down on her own and another got smacked off, but then seemingly got booted from the fight too. Couldnt use any skills or do anything for a few turns - but could walk normally as if he wasnt in a fight anymore. That glitch corrected itself after a turn or two. A Hook Horror attacked him so that got that character back into the fighting mode.
It was interesting to say the least.