The land of Airithrin is a horrible place, a land of reeking fumes and geysers of flame, lakes of lava and the strange life forms that emerge when elementals breed with mundane creatures
The flower commonly known as "Blood Petal," Haemorosa is a member of the Necrofoenae family - a family of plants that exhibit a disturbing affinity for the dead.
-Court Herbologist Gertrard di Vini, from his tome "dyFoenis Terrae Modae" - On the Plants of New Terra
At that moment the drizzle eased, and Ledoik could see as plain as day a blight upon the fields near the edge of the forest. Like a rock dropped into a pond, a wave of lighter shades of green emanated from the blights centre. Growing from the forest, where it was darkest, the field got lighter and lighter the further away it was from the blight. It was clear enough. The commander barked words, organising the archers, the few catapults they had and the giant rockslings to this side of the battlements. He motioned them to aim towards the blight, the dark patch near the fields edge
Regional insult for someone considered stubborn, or gullible.
Teenagers who run away from home to live in the wilderness may become feral. As they become more and more feral, they gain some supernatural powers (a la Peter Pan - ability to fly, things they imagine come true - possibly quite powerful), but at the expense of their humanity and ability to speak, comprehend complex subjects, etc. Maybe they have a leader: the most feral of them all.
A regression into a fantasy childlike state.