Thallax

Bulky models count as a number of models equal to the value X in brackets after the rule’s name for the purposes of Transport Capacity and whether a given unit outnumbers another in combat.

For example, a unit comprised of five models all of which have the Bulky (3) special rule, would count as 15 models when attempting to Embark on a Transport Vehicle or when deciding if they outnumber an enemy unit.

When making Shooting Attacks, djinn-sight reduces the benefits of any Cover Save the target unit has by -2 (a 4+ becoming a 6+, a 5+ being ignored entirely, and so on). Additionally, Infiltrators may not be set up within 24" of units with this special rule, regardless of line of sight.

When a model with this special rule suffers an unsaved Wound, it can make a special Feel No Pain roll to avoid being Wounded (this is a special Saving Throw which is made after unsaved Wounds are suffered).
Feel No Pain rolls may not be taken against unsaved Wounds that have the Instant Death special rule.
Roll a D6 each time an unsaved Wound is suffered. On a result that is equal to or greater than the value in brackets, the unsaved Wound is discounted - treat it as having been saved. On any other result the Wound is taken as normal.
For example, a unit with the special rule Feel No Pain (5+) would need to score a 5 or 6 in order to discount a Wound inflicted upon it.
This is a Damage Mitigation roll - any model may make only a single Damage Mitigation roll of any type for any given Wound (see page 174).

Relentless models can shoot with Heavy or Ordnance weapons, counting as Stationary, even if they moved in the previous Movement phase. They are also allowed to Charge in the same turn they fire Heavy, Ordnance, or Rapid Fire weapons.

When a unit that contains at least one model with this special rule takes Morale checks or Pinning tests, the unit ignore any negative Leadership modifiers. If a unit is both Fearless and Stubborn, the unit uses the rules for Fearless instead.