Massive Game/Sequence Breaking Bug. (ACT 2 SPOILERS)

[dûhul-ü ilmiye-î şâhane]

3 Player Multiplayer playthrough,
It's our first playthrough, we're spoiler free. Plz keep that in mind.
Can provide images later.

TLDR:
We killed Ketheric and freed Nightsong way before going to Shar's Temple. 10 hours later, currently, we're in Shar's Temple and can't get past Shadowheart's quest because there's no Nightsong here.
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How it happened:

When we first arrived the Moonrise Towers. We met Ketheric, killed the goblins etc. everything worked as intended up until then, we didn't progress much, just looked around. Then we found something, which broke our game. Inside Moonrise Towers, above the main hall there is a cracked wall with fleshy substance inside the crack.

My character sticks his hand in the wall crack, fails all rolls, then he falls into a fleshy place, alone. Which was right under the Moonrise Tower's Prison. There wasn't much in that place, just a few corpses laying around with some loot. Except, when we looked around a bit more, we catched a glimpse of an NPC in the minimap. Anyways, we couldn't go and interact with this NPC because there was a see-through glassy/fleshy wall between us and him which prevented us going into the space he was in.

This is where we F'd up,

Very casually, my buddy decided to try using Misty Step. Which worked. Then all party members went through thanks to the amulet that grants you Misty Step in Act 1.

We shouldn't have been able to use Misty Step to go there...

We explored the place, obviously, we then found Ketheric there. And the Nightsong of course. We figured we skipped some stuff but thought we had to initiate the boss fight with Ketheric because the door closed behind us when we entered the arena. At first, I honestly thought that this was a Dark Souls type introduction boss fight where you had to be beaten by the boss to progress, because of the fact that he was immortal and the level difference was too big. He was level 11 while we were 5-6.

Then we noticed and freed Nightsong from her "chains" using the "help" action while in combat. She helped us kill Ketheric, Myrkul was summoned, we killed him too. Although him being level 11 was fishy as I mentioned, the fight was so easy with Nightsong on our side that it didn't matter. It felt like a scripted fight, and since the entire fight lasted about 5 minutes. We moved on after utterly destroying Ketheric which ruined the immersion a bit tbh. To the point I googled "bg3 act 2 too short." This is not where the game breaks. No,

It gets worse,

Underwhelmed, we spent some time going through Creche Y'llek, we looked for secrets in Act 1. About 10 hours of gameplay passed, then we went back to the Shadowlands to continue where we left off after our disappointment. We killed the doctor etc. which was a harder fight than Ketheric. we finally arrived to Shar's temple. Shar demanded us to kill Nightsong, but we already freed her at this point so it doesn't make sense. Now, we cannot get past Shadowheart's quest because there's no Nightsong there lmao. We cannot progress past Shar's Gauntlet. We had to reload the last save, skip Shadowheart's quest and Shar's Temple, then moved on to Act 3. So the entire act 2 lasted about 2-3 hours for us.

Lots of friends told us that we missed out on a lot. But we can't go back because the save before killing Ketheric is 15 hours of gameplay ago. We're now level 8. We didn't even notice that we glitched through the game by using Misty Step because it was such a obvious thing to try at that point. Why was it allowed? Also why were we able to kill a level 11 boss with level 5-6 characters if it was a real fight?

What to do now? Start from the beginning? The immersion is already ruined.

[Nordil(Hun)]

Yeah is why i avoid the main quest where to go map markers:D

[liodegrey]

Did exactly the same things you did with your friends, unfortunately.
It seems like the game does not even recognize the possibility of you fighting Ketherick BEFORE you do the whole Temple shabang, which, for me, is a giant oversight on the developers part. The only thing you can do is either just forget about those quests, Shadowheart's questline included and go do Act 3. Or reload a save before you went to Moonrise.