Alpha Legion Infiltrators

I’ve been considering a way of modelling the covert infiltration specialities of the Alpha legion and come up with the following:

When army-building, the Alpha Legion builds a covert detachment of cultists and beastmen they keep off table to “drop-pod” in. They aren’t actually drop-podding in, it’s an abstraction to represent local forces rising up and striking at the heart of the opposition.

Alternatively, instead of drop-podding its covert detachment in, the Alpha Legion can either:

 

1. During the Rally Phase, choose an enemy detachment of cost less than or equal to its own covert detachment, the commander of which then makes a saving throw (4+). If the save is failed, the detachment switches sides and comes under control of the Alpha Legion player; modelling infiltrators successfully co-opting the detachment under the banner of Chaos.
   Whether the save is successful or not, the off-table covert detachment is ‘spent’ (i.e. cannot now be deployed).
   
   
   Or
2. During the Rally Phase, choose an enemy detachment of cost less than or equal to its own covert detachment to take a Rally Test. if it is failed, the Alpha Legion operatives take over the unit. The rest of the battle then continues with the Chaos player now in control of the detachment. The Chaos player may no longer attempt to 'turn' any detachments after they've been successful once.

 

In short, the three options are:

• Drop-Pod the detachment in (with the usual drop pod risks)
• A one-off high risk, high reward attempt to ‘turn’ an opposing detachment
• A multi-attempt at ‘turning’ a damaged detachment (i.e.has blast markers) and is possibly on the verge of breaking.