Gatebreaker Bolts

When you give a model this Relic, select one bolt weapon (see Codex: Space Marines) that model is equipped with. When the bearer shoots with that weapon, you can choose for it to fire a gatebreaker bolt. If you do, you can only make one attack with that weapon, but if that attack hits, make D3 wound rolls instead of one (each successful wound roll results in a wound that must be allocated). When resolving that attack, the weapon has an Armour Penetration characteristic of -5 and a Damage characteristic of 1 for that attack.