JarlFrank
I like Thief THIS much
The sheer amount of little things that change in quests based on your actions.Any specific examples from a playthrough which showcase the reactivity?No, Arcanum is.
In Shrouded hills, some gnome wizard who hates tech wants you to destroy the town's steam engine.
There's a retarded dwarf guarding it who attacks you if you attack the engine.
Usually, this ends with the dwarf being killed, especially if you have Virgil along because companions don't stop fighting when an enemy flees.
But if you go solo in that room, and let the dwarf live, he will tell the constable that YOU smashed the steam engine, and he will refuse to talk to you from that point onward, making you miss out on his quests.
I only found this out 15 years after first playing Arcanum btw, because leaving the dwarf alive is such an unlikely event in this quest, you deliberately have to go out of your way to not kill him.
If you kill the dwarf, he won't know who did it and gives you the quest to fix the engine.
For that you need a gear from the nearby mines. If you give the gear to the constable so he can fix the engine, the gnome wizard who told you to destroy it will consider you a traitorous flip-flopper and refuse to talk to you.
This cuts you off from his second quest, and from his services as a merchant.
In Tarant, the quest with the two fortune tellers is pretty interesting. One of them wants you to steal the other's crystal ball. If you kill her, she curses you, but if you tell her her rival wants the crystal ball she just gives it to you.
Carry it to the rival, tell her it was given as a gift, she panics and it turns out there was a curse on it that kills her. Oops!
When you return to the other fortune teller, she will reward you with one of two things: either she tells you the location of a stolen painting, or if you already found that, she gives you a permanent blessing.
The lost painting quest also has some nice reactivity. You can find out about the heist, talk to the woman whose painting was stolen, and have her give you the quest to find it.
But if you never talked to her before and arrive with the painting right away, she'll accuse you of being the thief trying to scam her: "How did you know I was looking for the painting? How did you get it?"
So you first have to explain yourself or she assumes you're the criminal!
The brothel quests for Madam Lil are different depending on your character's sex, men and women get different quests from her.
There's also a gentleman's club that doesn't allow women in, but you can talk to the proprietor and make a deal with him (suck him off lol).
There's a lot of little things like that throughout the game, checking for your race and sex, or having different outcomes depending on the order you do things in, including solving other quests beforehand, or already carrying the quest item with you, etc.