Help, I can't end the lost acolyte quest. I already found three of them but whenever I end the quest Othra will only ask is if I'm still looking. 
It says "1 acolyte still missing". I already found the one in the pond, one in the swamp, and already gave a restrain potion to the other one in the Ruin
The acolyte you gave a restrain potion to is not the missing acolyte, go check what the warriors are doing and look for clues.