Boy howdy, I sure hope Cult Arcana go back to no longer requiring Psychic/willpower Checks, have an addendum where they don't incur Perils, or Thousand Sons get a +3 to Willpower, or else things are going to get way worse (risking losing 6 models in a unit, that is). But surely the development team is aware that Thousand Sons were already one of the most kneecapped Legions in 2.0 and will address that. Surely.