We all know the area.
That one spot where the two yellow minotaurs spawn?
Yea I was there and I heard what sounded like that weird noise thrall make. Like a clicky and clacky.
But no thrall spawn in that area...
I then went looking for these thrall and only found a spot on the ground right under the large bridge like structure that my radar was indicating that an enemy was below me.
I heard the sounds but couldn't find them... Kinda freaked me out so I left the area..
Sounds were really creepy with turtle beaches
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Heard the same on the moon by the summoning pits. Maybe something shall happen or maybe Malok spirit since he made the similar sound when he fired those void bolts during the strike