A new dangerous overworld biome that covers most of the area around the edges of the map.
Nothing is able to grow in this new desolated area except a few new plants that are exclusive to the region, the fauna would mainly consist of reskinned warped versions of already existing creatures who'd be much more aggressive, deadlier and all of them would have the bear raging mechanic, but also slightly higher base quality than their non corrupted counterparts.
This area would be completely uninhabitable, hearthlings may not construct anything in this region.