Rules (5) Hexagrammatic Wards Silas Alberec and any unit he joins gains the Feel No Pain (5+) special rule against any close combat attacks and Witchfire powers made by models with the Daemon, Psyker, Champion of Chaos, Mark of Khorne, Mark of Nurgle, Mark of Slaanesh, Mark of Tzeentch, Daemon of Nurgle, Daemon of Khorne, Daemon of Slaanesh or Daemon of Tzeentch special rules.
In addition, when an opponent currently fighting a challenge against Silas Alberec successfully activates a Force weapon by spending a Warp Charge, a special Deny the Witch test may be immediately taken. This test succeeds on a 4+ and cancels the effects of the Force special rule. Soul-seared Champions Any unit in the same detachment as Silas Alberec with the Chapter Tactics rule may re-roll any failed Deny the Witch tests they are called upon to take. Chapter Tactics When choosing an army, all models in the same Detachment or Formation must be drawn from the same Chapter. If a unit's datasheet contains a Chapter in brackets after the Chapter Tactics special rule - for example, "Chapter Tactics (Ultramarines)" - the unit must always be drawn from this Chapter, and therefore cannot be included in a Detachment or Formation with any units that are drawn from other Chapters. All models drawn from a given Chapter benefit from that Chapter's Special Rule. If a unit contains models drawn from two different Chapters, it counts as from neither Chapter, and thus benefits from neither Chapter Tactic. And They Shall Know No Fear A unit that contains at least one model with this special rule automatically passes Fear and Regroup tests. When it Regroups, the unit does not make the 3" Regroup move, but can instead move, shoot (or Run) and declare charges normally in that turn. Furthermore, if a unit containing one or more models with this special rule is caught by a Sweeping Advance, they are not destroyed, but remain locked in combat instead. Independent Character Independent characters can join other units. They cannot, however, join units that contain vehicles or Monstrous Creatures. They can join other Independent Characters, though, to form a powerful multi-character unit! Independent Characters pass Look Out, Sir rolls on a 2+. A unit that contains one or more Independent Characters does not need a double 1 to Regroup if reduced to below 25% of its starting numbres, but instead tests as if it had at least 25% remaining.
Full details in BRB. Rule too long to copy verbatim. 