the only friendly fairy I've found is called "Leached Blossom Fairy" wich is in the south but still looked for that village (along the wall, following the south, no village. The fairy doesn't attack me but I can only fight her or talk which leads to three dots and no dialog.
This is the most southwest position I can get. If I go up, I reach the wall you mentionned but I cannot go to the leftto another area of the map. If I go right, I return to the Hidden Village and I cannot move further down.
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