Personifying the change that is Tzeentch, the Sorrow Swarm is a cloud of beautiful, multicoloured butterflies. Individually, they are about the size of an apple and look like ordinary specimens, though of particularly vivid-colours. Under close inspection, their nature is clear. Each of the butterfly’s legs ends in a sharp, curving claw that can pierce skin easily. On top of their slender bodies is a miniscule human head fitted with a long, dripping, pink tongue. The creature lands on a victim’s face and slices the skin, causing the creature to weep. The butterfly uses its disgusting tongue to lap up the salty fluid.