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|text= Now, that thing – I’m not sure, but I think it was an Acheri. A demon that disguises itself as a little girl. That still doesn’t tell us where we are. Andy, are you with me or what?

An Acheri demon is summoned by [[Ava Wilson]] in Cold Oak , South Dakota to kill the other Special Children over the past five months. It first appears when [[LilyJake Talley]] when Lily split off from the rest of the group. While walking through the woods, trying to find and exit, Lily hears a the voice of notices a young girl giggling, but chooses to ignore it standing at a window in an attempt to move forwarda schoolhouse. It also scrawls the words "I will not kill. The Acheri stalks and kills Lily, and hangs her " on the water tower in town from the rest of the group blackboard. As it is about to seeattack Jake, [[Sam]] dispels her with an [[iron]] rod.

The Acheri demon returns when [[Jake Talley]] notices While Lily is walking through the woods, trying to escape, Lily hears a young girl standing at a window in a schoolhousegiggling, as but chooses to ignore it is about . The Acheri demon stalks, kills, and hangs Lily over the windmill in town for the rest of the group to attack Jake [[Sam]] dispels her with an [[iron]] rodsee.  When Ava seemingly goes missing, and Sam and Jake set out to search for find her, she approaches [[Andy Gallagher]] and proceeds to summon breaks the salt line by the Acheriwindow. A cloud of [[Demon Smoke|black demon smoke appears outside ]] enters through the window, and as Ava had broken break in the salt line, it allowed and the Acheri to enter the room through the windowdemon manifests. Once inside, the Acheri manifests and knocks Andy down and wastes no time in killing him, as Andy screams in pain, his blood splatters everywhere until he is completely dead. Ava amusedly watches his corpse for a second, amused, then and begins screamingto attract attention. When Sam arrives to see what happened, he is quickly able to see sees through Ava's manipulations. After explaining how she survived the past five months, killing the other Special Children and as Ava attempts embracing her [[dark side]] to distract Sam with talkinglearn new psychic abilities, she summons the cloud of black smoke returns to the windowAcheri demon again. Just as it is about to enter, Jake comes from behind Aava Ava and twists snaps her neck, killing her instantly, causing the demonic smoke to retreat and disappear. As Sam attempts to leave the town, he tells Jake that the Acheri shouldn't come back now that Ava is dead.