If one of your heroes becomes a Chaos Spawn he is considered to be lost to the warband, unless your warband is from the Cult of the Possessed or Skaven. Followers of Chaos have a sort of semi-reverence for these mindless beasts, and the Skaven have long been adept at training and using the products of induced mutation.

When the hero "Spawns", any armor they were wearing is lost in the storm of violent mutation that overtakes the unfortunate warrior. Weapons and equipment are abandoned by the creature, however, and may be reclaimed by the warband. The new Spawn retains its previous characteristic profile and any existing mutations, and immediately gains an additional D6 mutations which should be generated on the Random Mutation Table. If the hero was previously a spell caster, all spell casting ability is lost. If the model became a Spawn as the result of a characteristic being taken down to zero, that characteristic becomes a 1 on the Spawn's profile. The Spawn's Movement characteristic may be deleted, as the Spawn is now subject to a n special rule that governs its movement on the table top. The Spawn is now subject to the following special rules:

The following is a table used to generate the colorful, exotic, and sometimes debilitating mutations that will be visited upon certain warriors at certain times (i.e. as a result of exposure to Wyrdstone, for example). The table may also prove useful to Game Masters who want to quickly generate some interesting mutants for a special scenario. The table uses a D66 roll, just like the Heroes Serious Injuries table in the rulebook. If the mutant rolls a mutation that it already possesses, re-roll it until a new mutation is generated.

Note: The great danger of mutation is that it will ultimately overwhelm the victim with the corrupting power of Chaos, reducing them to a monstrous and mindless Chaos Spawn. To represent this danger, if a warrior ever has a characteristic reduced to zero as the result of a mutation, they immediately degenerate into a loathsome Chaos Spawn (see the full rules for Chaos Spawn above).

Any member of a human, mercenary warband (this includes both Ostlanders and Averlanders) that receives a mutation marked with * is immediately drummed out of the warband by his suspicious peers. Remove the hero from the roster, his equipment is lost. Roll a D66 and consult the list below:

11 Acid Spray*: The mutant can spit acid at its foes. The acid spray uses the mutant's Ballistic Skill to hit, just as if the mutant were firing a missile weapon. The spray has a range of 8", and a Strength of 4. The mutant does not suffer any penalty for spraying a target at long range, nor does the mutant suffer any penalty for moving and spraying in the same turn.

12 Atrophy: A part of the mutant's body has become shriveled and atrophied. Roll a D6:

1 Head: The mutant is now subject to stupidity.
2-4 Arm: The mutant loses the usage of one arm. The mutant may only use a single one-handed weapon from now on. If both arms are lost the mutant must be retired from the warband unless it possesses a tail or bite attack of some kind.
5-6 Leg: The mutant loses the usage of one leg. Divide the mutant's Movement in half, rounding up. If both legs are lost, the mutant must be retired from the warband.

14 Beweaponed Extremities*: The mutant's hands are turned into weapons! The mutant may no longer use other weapons or equipment that would require the usage of hands. On the plus side, it no longer has to worry about being caught without a weapon! The mutant will gain the normal extra attack in hand-to-hand for using an additional hand weapon, and the weapon extremities follow the normal rules for weapons of their type (i.e. sword extremities may be used to parry). If the mutant grows two sword extremities, it may re-roll failed parries just as if it had a sword and a buckler. Roll a D6 for each arm to see what it becomes:

1-2: sword, 3-4: mace, 5-6: axe

16 Brightly Patterned Skin*: The mutant's skin becomes brightly colored with contrasting stripes, spots, or other patterns. No effect on play, but a great excuse to paint an interesting new model!

21 Burning Body*: The mutant's body is constantly burning with flickering tongues of hellish flame and burns with unnatural light. The warrior may not carry any weapons or armor unless they are magical, or forged from Gromril or Ithilmar. The mutant does not suffer the usual penalties for fighting with his fists (no -1 to the mutant's Strength, enemies do not add +1 to armor saves). The mutant always counts as having a lantern. Any model in base contact with the mutant suffers an automatic Strength 2 hit at the beginning of each close combat phase. The flames cannot cause critical hits.

22 Cloud of Flies: The mutant is permanently surrounded by a great swirling mass of flies. Opponents in close combat with the mutant are at -1 on all to hit rolls, as the flies buzz into eyes, noses, and mouths.

23 Cloven Hooves*: The warrior gains +1 Movement.

24 Crystalline Body*: The mutant's body becomes living crystal, which is tough, but easily shattered. The mutant's Toughness becomes 6, while its Wounds become 1. Neither of these attributes can subsequently be altered by experience or mutation. If an experience advance indicates a change in one of these characteristics, re-roll the advance until a different characteristic advance is obtained.

25 Elastic Limbs*: The mutant's arms can stretch out, allowing the mutant to attack from a distance. If the mutant is not in base contact with an enemy model at the beginning of the hand-to-hand combat phase, it may make one hand-to-hand attack against a single visible enemy within 6" of the mutant. The enemy does not get a chance to fight back.

26 Enormously Fat: The mutant becomes enormously fat and bloated. Divide its Movement in half, rounding up; add +1 to its Toughness; and reduce its Initiative by 1.

31 Extra Arm*: The mutant may use any single-handed weapon in the extra arm, giving him +1 attack when fighting in hand-to-hand combat. Alternatively, he may carry a shield or buckler in the extra arm. If a mutant who is unable to use weaponry (i.e. Possessed, Chaos Spawn, etc.) gains this mutation, they simply gain an extra attack; they are still not permitted to use weapons.

32 Extremely Thin: The mutant becomes a matchstick figure, sickly thin and bony. Divide its Toughness in half, rounding up.

33 Eyestalks*: The mutant has stalked eyes, similar to a crab. The mutant now causes fear.

34 Fangs*: The mutant grows huge fangs, giving it an extra bite attack (unless it already has one) in each hand-to-hand combat phase. The bite attack uses the mutant's normal Strength.

35 Furry*: The mutant grows a covering of long, dense fur. The mutation changes the mutant's appearance only; and has no effect on its profile.

36 Great Claw*: One of the mutant's arms ends in a great, crab-like claw. He may carry no weapons in this arm, but gains an extra attack in hand-to-hand combat with a +1 Strength bonus.

41 Hideous: The mutant causes Fear, and is seldom invited to parties.

42 Horns*: The mutant's head grows horns, and it gains an extra gore attack in hand-to-hand combat at the mutant's normal Strength The mutant may no longer wear a helmet.

43 Iron Hard Skin*: The mutant's skin is covered in iron and steel scales. The mutant's armor save is improved by +1 (i.e. a 5+ save becomes a 4+). Note that a warrior's armor save may never improve to better than a 1+ save. If the mutant has no armor, their skin alone gives them a 6+ armor save.

44 Mace Tail*: The mutant grows a flexible tail with a mace-like bony tip. Unless it already has a tail, the mutant gains an extra tail attack in each hand-to-hand combat phase at the mutant's Strength +1. If the mutant already has a tail, it will have to decide at the beginning of each hand-to-hand phase which tail it wishes to use.

45 Moronic: The mutant's mind shrinks. The mutant is now subject to Stupidity.

46 Plague Bearer*: The mutant carries a hideous, Chaos-tainted disease. The mutant's limbs are covered in open sores, and the mutant is dramatically weakened by its condition. Reduce the mutant's Movement and Initiative by -1. Any time the mutant hits an enemy in hand-to-hand combat, there is a chance they have infected their foe with this debilitating disease: the enemy model must roll equal to or less than its Toughness on a D6 to avoid contracting the sickness. If the roll is higher than the model's 'roughness, they suffer the -1 to Movement and Initiative penalty for the rest of the battle, (after which it is assumed they get immediate herbal remedies and plenty of rest to keep the disease from setting in permanently!). The Plague Bearer may not infect the same model more than once in a single battle. In addition, the Plague Bearer's ghastly appearance means it now causes fear.

51 Poisonous Bite: The mutant grows small fangs which can secrete a potent poison.
Unless the warrior already has a bite attack, it gains an extra attack in each hand-to-hand combat phase due to its deadly bite. The poisonous bite is a Strength 5 attack, but is reduced to Strength 2 if the target of the bite is immune to poison. If the mutant already possesses a bite attack, it is simply upgraded to include the poisonous effect described above.

52 Prehensile Tail*: The mutant grows a prehensile tail. Unless the mutant already has a tail attack, he gains an additional attack with this tail in each hand-to-hand combat phase. The mutant may hold and use any singlehanded weapon in the tail, or alternatively, he may carry and use a shield or buckler with it. If a mutant with other tail attacks does use an equipped prehensile tail in a hand-to-hand combat phase, he may not use any of his other tail attacks during that phase; a single tail must be selected for use at the beginning of each hand-to-hand phase. If a mutant unable to use weaponry (i.e. Possessed, Chaos Spawn, etc.) gains this mutation, they simply gain an extra attack (unless they already possess a tail attack); they remain unable to use weapons.

53 Regeneration: The mutant can often heal instantly from wounds it suffers in battle. When the mutant suffers one or more Wounds, it may try to regenerate the damage. Roll a D6: on the roll of a 4+, the mutant has instantly healed itself back to full Wounds. If less than a 4 is rolled, the mutant's regenerative powers have been temporarily exhausted, and it may not attempt further regenerations for the remainder of the battle.

54 Resilient: The mutant's skin thickens, or becomes scaly, or otherwise increases its resilience to damage. Increase the mutant's Toughness by +1.

55 Scorpion Tail*: The mutant has a long barbed tail with an envenomed tip, allowing him to make an extra Strength 5 attack in each hand-to-hand combat phase (unless the mutant already has a tail attack, in which case it will have to select a single one of its available tail attacks in each hand-to-hand phase). If the model hit by the tail is immune to poison, the Strength of the hit is reduced to 2.

56 Skull Face*: The flesh of the mutant's face dissolves, leaving a skull. The mutant now causes fear.

61 Spines*: Any model in base contact with the mutant suffers an automatic Strength I hit at the beginning of each close combat phase. Spines will never cause critical hits.

62 Stunted: The mutant's body becomes hunchbacked and stiffened. Reduce the mutant's Movement and Initiative by -1.

63 Suckers*: The mutant's limbs are covered in adhesive suckers. The mutant automatically passes Initiative tests when climbing.

64 Tentacle*: One of the mutant's arms ends in a tentacle. He may grapple his opponent in close combat to reduce his attacks by -1, down to a minimum of 1. The mutant may decide which attack his opponent loses.

65 Warts: The mutant is covered in repellent warts. The mutant's profile is unaffected.