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The two of you explode from your hiding place and plunge into the demons ranks!
( 200 / 200 Galanoth Thorn Demons killed )
That's as far as my quest book goes.
Standing in Galanoth Forest (Boneyard) at 8, 12 on the ? tile awaiting next phase in quest, but there's nothing there for me to interact with.
Edit: went back to the unmarked quest tile in Galanast Forest (Thorns), and moved the quest along. Sorry for the false alarm.