Most curses dissipate over time, but a few grow stronger or are strengthened by great tragedies. Malagrym are magical curses that have "come alive" as a single creature, and are attached to a particular place or person as its host. Some of these eventually grow powerful enough to transfer to a new host or even break loose entirely, roaming freely and inflicting their hex on anyone who crosses their path.
Malagrym are often invisible, but may appear as vortices of black energy. There are rumors of malagrym that have grown so strong that they've even gained the power of speech