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Triumph over a goblin invasion, a ragtag regiment of crude, barbaric, pointy-eared warriors and their shadowflame sorcerers.
So by this we can confirm that the goblins drop the shadowflame hex doll?
'Twas hoping that @Lyra's idea for killing King Slime with baby slime minions would get it in, but since you don't have any achievements other than ones you would do in a regular playthrough, it's not a big deal.