In one of my quests there is a person involved in Thievery that I am suposed to find in some forest. But I don't know were it is. Does anyone know what forest it is and where it is?

I think that Mesera is located in a cave 1 east of the South Giddolan entrance. If you haven't found that yet, the entrance is 3 south of the cave that goes under Lake Varandeep. To get to the cave go 1 south 1 west of the plains of endlesswind ruins map.Note however, that I might be thinking of the wrong cave.

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"it cannot be seen, cannot be felt, cannot be heard, cannot be smelt.
It lies behind stars and under hills, and empty holes it fills
It comes first and follows after, ends life, kills laughter"-Golum's riddle, the hobbit, J.R.R. Tolkien