Tbh the Goblin path isn't even evil, its just Chaotic/Stupid. A head druid is going to be much more likely to be able to heal you than a crazy Goblin.
It can be both chaotic and evil, but I'd concede that it is chaotic/stupid
primarily. During 50+ hours in multiple partial playthroughs I did not even consider once talking to, much less joining, the goblins and the Absolute. The beginning of the game makes it just so transparently clear (first fight is against goblins; first encounter with Absolute has a tadpole crawling out of someone) that this is a terrible option. And by "terrible" I don't mean evil, just bad/chaotic/leading nowhere. While I'm used to chaotic-evil dialogue options, it's imho very counter-intuitive to have a chaotic-evil quest line.
You find out in exactly the perfect time you need to know ... unless you attacked Dror Ragzlin and Gut allready. laugh
But if you talk to them, fiding what they can offer you, exactly as the evil character should have ... you find out about this possibility in best moment, meaning exactly the moment you created it.
I think you mean to say "the last possible moment". Why would I just walk up to a ton of very-likely-to-be-enemies to see what they have to tell me? The perfect time to know that a transaction can take place is
before entering the metaphorical dragon's lair, when I either find out what they have to offer me or what I have to offer them, whichever comes last.
As others have mentioned it is a fallacy to assume that just because my character is evil and the goblins are too, we friends and I just walk up to them. In my mind they (and especially their mindflayer overlords) were a threat to me as established by the game regardless of my alignment.
