Forest of Illusion

Forest mirror - the user uses Nen to create a mirror to observe intelligent creatures within the forest

Forest of illusion v1 - simple miss direction with sounds and location changes

Forest of illusion v2 - the people within the forest begin to experience hallucinations

Forest of illusion v3 - the people's minds within the forest are attacked by said hallucinations

True Forest of illusion - the minds of the people within the forest begin to fully collapse under mental strain from the hallucinations(both within their conscious and physical ones fully visible), most at this stage go insane and commit suicide, no person has ever come back the same when used

General information - the Nen Ability forest of illusion and all its other forms are locked to one area, once used the Nen Ability will stay active permanently, the user is also affected, however with time the user and others can learn to navigate through the forest. Just like a normal forest it has its own ecosystem. Fires can not destroy the forest and its entirety, but they can impact a small area. Special thanks to user: Paper Crow for recommending an illusion type Nen ability.