Melta bombs

If a model has this special rule, or is attacking with a Melee weapon that has this special rule, it rolls an additional D6 for armour penetration in close combat.

If a model makes a shooting attack with a weapon that has this special rule, it rolls an additional D6 for armour penetration. In either case, this special rule has no effect against non-vehicle models.

A model attacking with this weapon Piles In and fights at Initiative step 1, unless it is a Monstrous Creature or a Walker.