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  WARHAMMER 40,000 – CODEX: DEATHWATCH
  WARHAMMER 40,000 
  CODEX: DEATHWATCH
  Official Update Version 1.1
  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 67 – Watch Captain in Terminator Armour, 
  Wargear Options
  Change the first bullet point to read:
  ‘•  This model may replace its storm bolter with a 
  lightning claw, storm shield, thunder hammer or one 
  item from the Terminator Combi-weapons list.’
  Change the second bullet point to read:
  ‘•  This model may replace its relic blade with a lightning 
  claw, storm shield or one item from the Terminator 
  Melee Weapons list.’
  Pages 68 and 70 – Librarian and Chaplain, 
  Wargear Options
  Change the first bullet point to read:
  ‘•  This model may replace its bolt pistol with a boltgun 
  or one weapon from either the Pistols or Terminator 
  Combi-weapons list.’
  Page 73 – Intercessors, Wargear Options
  Change the second bullet point to read:
  ‘•  For every five Intercessors and/or Intercessor 
  Sergeants, one may take an auxiliary 
  grenade launcher.’
  Page 87 – Corvus Blackstar, Infernum halo-launcher
  Change the ability text to read:
  ‘If an enemy unit that can Fly targets a supersonic 
  model with an infernum halo-launcher in the Shooting 
  phase, your opponent must subtract 1 from the 
  subsequent hit rolls.’
  Page 96 – Targeting Scramblers
  Change the rules text of this Stratagem to read: 
  ‘Use this Stratagem after an enemy T’au Empire unit 
  that is equipped with one or more markerlights has 
  resolved all attacks in the Shooting phase. Select one 
  Deathwatch unit from your army and immediately 
  remove all markerlight counters from that unit.
  FAQs
  Q: How do Dragonfire bolts behave when shooting units that 
  aren’t in cover, but have a rule that means they have ‘the 
  benefit of cover’ (e.g. Jormungandr units with the Tunnel 
  Networks ability)? Would you still add 1 to the hit rolls for 
  Dragonfire bolts?
  A: No. You add 1 to the hit rolls against units that are in 
  cover (i.e. entirely on or within a terrain feature). Units 
  receiving the benefit of cover while not being in cover do 
  not count.
  Q: How does the xenophase blade interact with invulnerable 
  saves that don’t allow saves to be re-rolled (e.g. from an 
  Archon’s Shadowfield ability, or the Chaos Daemons’ Warp 
  Surge Stratagem)?
  A: In such cases, the successful invulnerable saves 
  must be re-rolled. The intent of the wording of 
  Shadowfield and Warp Surge is to prevent a re-roll of an 
  unsuccessful save, not to prevent an obligatory re-roll of 
  a successful one.
  Q: If I use the Castellan of the Black Vault Warlord Trait 
  on a weapon with multiple profiles, like a combi-weapon or 
  guardian spear, does the additional damage apply to all of that 
  weapon’s profiles?
  A: Yes.
  Q: Can a Watch Captain replace his chainsword and master-
  crafted boltgun with a storm bolter and another chainsword, 
  and then replace his ‘new’ chainsword with a relic blade?
  A: No.
  
SOURCE: textdata/thevault/Warhammer/40k/1st-8th Editions (Prior)/8th Edition (2017)/5) FAQs/2018 FAQs/40k 8e - deathwatch en-1.pdf