Originally Posted by fylimar
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Your reasoning for staying with the group could as well be used for every other npc, you've met and help - especially from the tiefling group and Barcus. Halsin is not that special - he jus thappen to be a buff elf.

No, I dont think so. Neither Barcus nor the Tieflings have direct ties to the curse or the cult, Halsin does. Larian maybe made it more complicated than it had to be but thats the crux of it.

Halsin wanting to save his homeland from the curse that is related to the cult of the absolute that is full of members with the same Ilithid tadpole we are infected with is more than enough for him to join us narratively. We can help him because we are not nunder the control of the absolute and he helps us in return. The tiefllngs and Barcus do not have a real direct reason to join us. Their goal isnt to stop the absolute or the shadow curse, they are just there by happenstance.