Escalation

Tyranids have been playing an Apocalypse unit.
The Escalation rule book covers this.
We do not own the rules but they basically come down to :

Only one unit can be played in your army.

Killing the 'Lord of War' (Apocalypse unit) gives an additional Victory Point.
If the Lord of War is a Super Heavy Vehicle, it gives a Victory Point per three Hull Points.

An army fighting against a Lord of War gains +1 to Seize the Initiative (Eg 5&6 to Seize)

An army fighting against a Lord of War can choose to roll on an alternative Warlord Traits table.
I suggest that we play : The Warlord and his Unit can re-roll to hit when attacking the Lord of War.