Shikotsumyaku: Death Rose

The user generates a large skeletal structure underground with various spikes protruding from it's sides and a canopy containing smaller pointed protrusions as well (in a way the structure resembles a giant rose), preferably just under their enemies. Once it is completed, it starts spinning as it "grows" towards the surface, its canopy gradually closes, killing anyone caught within it by crushing or impaling them, while the "thorns" severely wound any who stand beside the "stalk". Once it has stopped growing, the thorns can separate from the stalk and shot in all directions, acting as deadly shrapnel.