Adrastus Bolt Caliver

When firing a weapon that Gets Hot. roll To Hit as normal. For each unmodified To Hit roll of 1, the firing model immediately suffers a single Wound with an AP value equal to that of the weapon that was used to attack (Armour Saves, Invulnerable Saves and Feel No Pain rolls can be taken, but not Cover Saves or Shrouded rolls) - this Wound cannot be allocated to any other model in the unit. A Vehicle instead rolls a D6 for each roll of a 1 To Hit. If this roll results in a 1 or 2, the Vehicle suffers a Glancing Hit.

Gets Hot and Weapons that do not Roll To Hit 
Weapons that do not roll To Hit (such as Blast weapons) must roll a D6 for each shot immediately before firing. On a 2+, the shot is resolved as normal. For each roll of a 1, the weapon Gets Hot; that shot is not fired and the firing model immediately suffers a single Wound with an AP value equal to that of the weapon that was used to attack (Armour Saves, Invulnerable Saves and Feel No Pain rolls can be taken, but not Cover Saves or Shrouded rolls) – this Wound cannot be allocated to any other model in the unit. A Vehicle instead rolls a D6 for each roll of a 1 to Hit. If this roll results in a 1 or 2, the Vehicle suffers a Glancing Hit.

Gets Hot and Re-rolls
If a model has the ability to re-roll its rolls To Hit (including because of BS 6+ or the Twin-linked special rule), a Wound is only suffered if the To Hit re-roll is a 1; it may also re-roll Gets Hot results of 1 for weapons that do not roll To Hit.

If a model suffers an unsaved Wound from an attack with this special rule, it is reduced to 0 Wounds and is removed as a casualty.

A weapon or ability with this special rule can only be used once during the course of a battle. Once a weapon with the One Use or One Shot special rule has been used to attack, it is no longer counted as a weapon and may not be destroyed (for example, by rolls on the Vehicle Damage table) or repaired by any other rule or effect.