Some AIRCRAFT models have 'Hover' listed in their abilities. When you are instructed to Declare Battle Formations, before doing anything else, you must first declare which models from your army with this ability will be in Hover mode.

If a model is in Hover mode,  then until the end of the battle, its Move characteristic is changed to 20", it loses the AIRCRAFT keyword and it loses all associated rules for being an AlRCRAFT model. Models in Hover mode do not start the battle in Reserves, but you can choose to place them into Strategic Reserves following the normal rules if you wish.

Deadly Demise

Some models have 'Deadly Demise x' listed in their abilities. When such a model is destroyed, roll one D6 before removing it from play (if such a model is a TRANSPORT, roll before any embarked models disembark). On a 6, each unit within 6" of that model suffers a number of mortal wounds denoted by 'x' (if this is a random number, roll separately for each unit within 6").

Oath of Moment

If your Army Faction is Adeptus Astartes, at the start of your Command phase, select one unit from your opponent’s army. Until the start of your next Command phase, that enemy unit is your Oath of Moment target. Each time a model with this ability makes an attack that targets your Oath of Moment target:
■ You can reroll the Hit roll
■ If you are using a Codex: Space Marines Detachment and your army does not include one or more units with the Black Templars, Blood Angels, Dark Angels, Deathwatch or Space Wolves keywords, add 1 to the Wound roll as well.

Profiles:

Unit	M	T	SV	W	LD	OC
Stormfang Gunship	20+"	10	3+	14	6+	0

Abilities
Frozen Prey: In your Shooting phase, after this model has shot, if an enemy MONSTER or VEHICLE unit was hit by one or more of those attacks made with this model’s helfrost destructor, until the end of your opponent’s next turn, that enemy unit is Frozen. While a unit is Frozen, subtract 2 from that unit’s Move characteristic, and subtract 2 from Advance and Charge rolls made for that unit.
Damaged: 1-5 Wounds Remaining: While this model has 1-5 wounds remaining, each time this model makes an attack, subtract 1 from the Hit roll.

Transport
Stormfang Gunship: This model has a transport capacity of 6 ADEPTUS ASTARTES INFANTRY models. Each JUMP PACK, WULFEN, GRAVIS or TERMINATOR model takes up the space of 2 models and each CENTURION model takes up the space of 3 models.

Modifiers:

append name (Battle-hardened)

and

16+ selections of Experience Points in self (recursive)

30- selections of Experience Points in self (recursive)