A Chaos Sorcerer may use this psychic power in the assault phase instead of making his normal close combat attacks. Pick an enemy model within 2" of the Sorcerer and then take a Psychic test in order to use the power. If the test is successful, roll a D6. If you roll over the victim's Toughness, or you roll a 6 no matter what the victim's Toughness is, then the victim is slain, with no armour or cover saves allowed (Invulnerable saves may be taken as normal). In addition they turn into a Chaos Spawn if you have a Chaos Spawn model to represent them, but if you do not have a suitable model, simply remove them as a casualty. Chaos Spawn have the same characteristics and special rules as a Beast of Nurgle (see Chaos Gifts above), except that they are treated as independent characters. They are counted as being part of the Chaos army from the moment they are transformed and may attack in that assault phase, as long as they have not already done so previously. Models turned into Chaos Spawn are treated as having been killed for Victory point purposes, even if the Spawn survives the battle.
Fleshy Curse
Source: Codex: Chaos Space Marines (1999), p. 29