TEXT: 1
  WARHAMMER 40,000 – CODEX: THOUSAND SONS
  WARHAMMER 40,000 
  CODEX: THOUSAND SONS
  Official Update Version 1.3
  Although we strive to ensure that our rules are perfect, 
  sometimes mistakes do creep in, or the intent of a rule 
  isn’t as clear as it might be. These documents collect 
  amendments to the rules and present our responses to 
  players’ frequently asked questions. As they’re updated 
  regularly, each has a version number; when changes 
  are made, the version number will be updated, and any 
  changes from the previous version will be highlighted 
  in magenta. Where a version number has a letter, 
  e.g. 1.1a, this means it has had a local update, only in 
  that language, to clarify a translation issue or other 
  minor correction.
  ERRATA
  Page 68 – Daemon Prince of Tzeentch
  Add ‘Psyker’ to the keywords line.
  Page 73 – Tzaangors, Wargear Options
  Add the following bullet point: 
  ‘• One Tzaangor can take an Icon of Flame (pg 90)’
  Page 74 – Horrors, Power Rating
  Change the Power Rating to read ‘4’
  Page 74 – Horrors, Description
  Change the second sentence to read:
  ‘It can include up to 10 additional Horrors (Power 
  Rating +4) or up to 20 additional Horrors (Power 
  Rating +8).’
  Page 74 – Horrors, Magic Made Manifest
  Change this ability to read:
  ‘Magic Made Manifest: A unit of Horrors can attempt 
  to manifest one psychic power in each friendly Psychic 
  phase, and attempt to deny one psychic power in each 
  enemy Psychic phase. However, when you do so, only 
  roll a single D6 for the Psychic test or Deny the Witch 
  test, and use the result to determine the outcome. Note 
  that this means the Horrors can’t roll a double 1 or 
  6 to suffer Perils of the Warp. In addition, if the unit 
  manifests the Smite psychic power whilst it contains less 
  than 10 Pink Horrors, it only inflicts 1 mortal wound 
  rather than D3.’
  Page 79 – Chaos Spawn, Abilities, Mutated Beyond 
  Reason, Designer’s Note
  Change the last sentence to read:
  ‘Each has a points value of 25 (this includes all of 
  its weapons).’
  Page 96 – Fire Frenzy
  Change the first sentence of rules text to read: 
  ‘Use this Stratagem in your Shooting phase, just before a 
  Thousand Sons Helbrute from your army shoots.’
  Page 96 – Cabalistic Focus
  Change this Stratagem to read:
  ‘Use this Stratagem before attempting to manifest a 
  psychic power with a Thousand Sons Psyker from 
  your army that is within 6" of at least two other friendly 
  Thousand Sons Psyker units. Add 2 to the Psychic test.’
  Page 96 – Killshot
  Change the second sentence of rules text to read: 
  ‘Add 1 to the wound rolls and damage for all of the 
  Predators’ attacks that target Monsters or Vehicles 
  this phase.’
  Page 97 – Boon of Tzeentch, Spawndom
  Change the third sentence to the following:
  ‘If you do so, set up the Chaos Spawn within 6" of the 
  character and more than 1" from any enemy models 
  before removing them as a casualty.’
  Page 97 – Warpflame Gargoyles
  Change the second sentence of rules text to read:
  ‘Pick a Thousand Sons Vehicle from your army (but 
  not a Helbrute or Heldrake) and roll a D6 for each 
  other unit (friend or foe) within 3" of it, subtracting 2 
  from the roll if the unit being rolled for is a Character 
  or Vehicle.’
  Page 98 – The Flesh Change
  Change the fourth sentence to the following:
  ‘If you do so, set up the Chaos Spawn within 6" of the 
  character and more than 1" from any enemy models 
  before removing them as a casualty.’
  Page 101 – Dark Hereticus Discipline, Gift of Chaos
  Change the third sentence to read:
  ‘If a Character is slain by this power, you can add one 
  Chaos Spawn to your army within 6" of the character 
  and more than 1" from any enemy models before they 
  are removed as a casualty.’
  Page 101 – Discipline of Tzeentch, Bolt of Change
  Change the first sentence of rules text to read:
  ‘Bolt of Change has a warp charge value of 8.’
  
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  WARHAMMER 40,000 – CODEX: THOUSAND SONS
  Page 101 – Discipline of Tzeentch, Bolt of Change
  Change the third sentence to read:
  ‘If a Character is slain by this power, you can add a 
  Chaos Spawn to your army within 6" of the character 
  and more than 1" from any enemy models before they 
  are removed as a casualty.’
  Page 101 – Discipline of Tzeentch, Gaze of Fate 
  Change the second sentence to read:
  ‘If manifested, until the end of the turn you can re-roll 
  one single dice roll that you have rolled.’ \
  Page 101 – Discipline of Tzeentch, Treason of Tzeentch
  Change the third and fourth sentences to read:
  ‘If the result is greater than the character’s Leadership 
  characteristic, until the end of the following Fight phase 
  treat that character as if it were a friendly model from 
  your army in your Shooting, Charge and Fight phases.’ 
  FAQs
  Q: Do I score a victory point for Slay the Warlord if my 
  opponent targets their Warlord with The Flesh-Change?
  A: Yes.
  Q: When a model’s datasheet states that it knows, for example, 
  three psychic powers from the Discipline of Change and/or Dark 
  Hereticus discipline, does this mean I can choose six psychic 
  powers for them in total?
  A: No, it means you can choose three psychic powers for 
  them, in one of the following combinations: 
  1) three from the Discipline of Change.
  2) three from the Dark Hereticus discipline.
  3) one from one discipline and two from the other.
  Q: The Brotherhood of Sorcerers ability increases the range of 
  psychic powers by 6". If a psychic power has a secondary effect 
  that has a range (such as Infernal Gateway, which has an 
  initial range of 12" but then affects all other units within 3"), 
  does the range increase apply to the initial range, the secondary 
  range, or both?
  A: It only applies to the initial range; so in the case of 
  Infernal Gateway, you would identify the nearest visible 
  enemy model within 18" of the psyker, rather than 
  within 12". That model’s unit and every other unit within 
  3" of that model would then suffer D3 mortal wounds.
  Q: Can I replace the Smite psychic power when using the Chaos 
  Familiar Stratagem?
  A: Yes.
  Q: If I manifest the Gift of Chaos psychic power, and target 
  a unit whose models have different Toughness characteristics, 
  which one should I use?
  A: Use the highest Toughness characteristic in the 
  target unit.
  Q: How should Perils of the Warp be resolved against units led 
  by an Aspiring Sorcerer or Scarab Occult Sorcerer?
  A: Any mortal wounds suffered are applied to Sorcerer’s 
  unit, so can be applied to another model if you wish (if 
  a model in that unit has already suffered any wounds, it 
  must still be applied to this model first). 
  Q: If the Aspiring Sorcerer or Scarab Occult Sorcerer from a unit 
  has been slain, is this unit still treated as being a Psyker?
  A: Yes.
  Designers Note: Whilst these units would not be able to 
  manifest or deny any psychic powers, any abilities, objectives or 
  effects which affect psykers are still likely to affect these warp-
  infused, animated suits of armour.
  Q: Can the Killshot Stratagem be used to affect 
  Hellforged Predators?
  A: No. The Killshot Stratagem can only be used to affect 
  models using the Chaos Predator datasheet.
  Q: If a Character is being treated as part of the opponent’s 
  army due to the Treason of Tzeentch psychic power, must units 
  from that Character’s actual army fight it in the Fight phase 
  if they are within 1" of that Character?
  A: Yes.
  
SOURCE: textdata/thevault/Warhammer/40k/1st-8th Editions (Prior)/8th Edition (2017)/5) FAQs/2019 FAQs/40k 8e - thousand_sons_en.pdf