All units with the VotLW special rule re-roll failed To Hit rolls in every round of close combat when attacking Imperial Fists units. However, all Imperial Fists units have the Hatred (Iron Warriors) special rule.
Units with the VotLW special rule has the FNP (6+) special rule.
Units of Obliterators and Mutilators are Troops choices instead of Elites choices.
Units can re-roll armour penetration rolls against buildings that do not result in a glancing hit or penetrating hit, and add 1 to the result when rolling on the Building Damage table. In addition, units of Havocs, Obliterators, and Mutilators have the Tank Hunters special rule.
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 not a saving throw and so can be used against attacks that state that 'no saves of any kind are allowed', for example those inflicted by Perils of the Warp). Feel No Pain saves may not be taken against Destroyer attacks or against unsaved Wounds that have the Instant Death special rule. Roll a D6 each time an unsaved Wound is suffered. On a 4 or less, you must take the Wound as normal. On a 5+, the unsaved Wound is discounted - treat it as having been saved. If a unit has the Feel No Pain special rule with a number in brackets afterwards -Feel No Pain (6+), for example - then the number in brackets is the D6 result needed to discount the Wound.
A unit that contains at least one model with this special rule re-rolls failed armour penetration rolls against vehicles (both with shooting and in close combat) and can choose to re-roll glancing hits, in an attempt to instead get a penetrating hit - but the second result must be kept.