Infernal Tempest

Models with this special rule gain the Hammer of Wrath (1) special rule or, if they already have a version of the Hammer of Wrath (X) special rule, they increase the value in brackets by +1. All wounds inflicted by any variant of the Hammer of Wrath (X) special rule possessed by a unit with this special rule also gain the Deflagrate special rule.
Additionally, models with this special rule gain a Shooting Attack with the following profile: (Elemental Eruption)

After normal attacks by this weapon have been resolved, count the number of unsaved Wounds caused on the target unit. Immediately resolve a number of additional automatic Hits on the same unit using the weapon’s profile equal to the number of unsaved Wounds – these can then be saved normally. Models in the targeted unit must still be in range in order for these additional Hits to take effect. These additional Hits do not themselves inflict more Hits and do not benefit from any other special rules possessed by the attacking model, such as Preferred Enemy (X) or Precision Strikes (X).