Guerrillas In The Mist
Mistwraiths appears to be amorphous blobs capable of absorbing bones and tissue of other creatures to gain shape. However, these shapes were often horrific and mixed many different species into one.
They are what scares the Skaa into staying at home and not venturing out into the mists, and many circumstances are attributed to these almost legendary monsters. There are few who have truly seen mistwraiths, and so their attributed violent qualities are unclear.
Those who have seen them tell of frightful creatures with the bones and parts of many creatures (humans included) comprising their form.