Star Phantoms

Once per game, the player may declare the use of this ability and its effects last from the start of the controlling player's Shooting phase until the start of their next Shooting phase. During this period, all units in the detachment with Chapter Tactics (Star Phantoms) count their Rapid Fire, Assault, Salvo and Heavy Weapons as being twin-linked.

Any unit in the detachment arriving via Deep Strike may re-roll any Reserve roll of 1 if its controlling player wishes.

If a shooting weapon has the twin-linked special rule, or is described in a model's wargear entry as twin-linked, it re-rolls all failed To Hit rolls.

For a Blast weapon, if the scatter dice does not roll a hit, you can choose to re-roll the dice with a Twin-linked Blast weapon. If you choose to do so, you must re-roll both the 2D6 and the scatter dice. 

Twin-linked Template weapons are fired just like a single weapon, but must re-roll failed To Wound rolls and armour penetration rolls.