|Living pools of black fluid, they can take any shape they desire at a moment’s notice. They can ooze through cracks, hide behind or beneath anything, and suddenly leap out to attack a victim. The one reliable sign that a formless spawn is nearby is a curious fetid scent like that of stagnant swamp water. Formless spawn are inky black with no eyes and no internal organules. A formless spawn will attempt to seize a convenient por- tion of its intended victim. If the victim fails an Opposed Roll to Evade, the formless spawn seizes the body part and begins to digest it, absorbing 1d8 Hit Points worth of flesh and bone per round. Unless the victim succeeds in an opposed Brawn Roll against the formless spawn and breaks away, or other characters succeed in driving off or killing the formless spawn, it will attempt to fasten onto some other part of the victim and digest that, until its victim dies. Dam- age inflicted by a formless spawn is permanent, as the body parts ingested by it are dissolved and absorbed by the creature.
Source: Weird of Hali pg129