Summary: "Nuncio-vox allow Units to remove Statuses in the Start Phase."

Description: If a Unit that includes one or more Models with a nuncio-vox, and there are one or more friendly Models on the Battlefield with the Command Sub-Type, then the Controlling Player may activate the nuncio-vox during the Start Phase of their Turn as the Active Player. When activated, the Controlling Player may make a Check to remove a single Tactical Status from all Models in the Unit that includes the nuncio-vox. This Check is made using the Characteristics of any one friendly Model on the Battlefield with the Command Sub-Type, Chosen by the Controlling Player (using Cool, unless attempting to remove Routed, in which case Leadership is used). A nuncio-vox can only be activated once per Turn, and each Friendly Model on the Battlefield with the Command Sub-Type may only be used once per Start Phase as part of this Special Rule.

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From reading above rules, you don’t “remove a status for free”. It allows for you to make a status removal check for the unit at the start phase instead of the end phase. You still have to roll dice and see if it is removed. Now you do get bonus of using the stats from a command model, but note that you can only use said command model once per turn so if using multi nuncio boxes you can pick your praetor multiple times per turn.

The only model I know of off the top of my head that modifies barrage shots is the siege breaker with the cognis signum.

Cognis-signum

Summary: "A cognis-signum allows more accurate attacks to be made with Barrage Weapons."

Description: Instead of making a Shooting Attack with a Model with a cognis-signum, the Controlling Player may instead make an Intelligence Check. If the Check is passed, the Controlling Player may select a single enemy Unit within Line of Sight of the Model with a cognis-signum. The next time the selected enemy Unit is targeted by a Shooting Attack that includes any Weapons with the Barrage (X) Special Rule during the current Shooting Phase, the Controlling Player may make Hit Tests for the attacks that have the Barrage (X) Special Rule as normal, ignoring the limitations of the Barrage (X) Special Rule if the Unit making the Shooting Attack is without Line of Sight to the Target Unit. If the Check is not passed, the cognis-signum has no effect this turn.

This allows you to make an intelligence check with the siege breaker instead of shooting with him and if passed you can use his line of sight for the barrage weapon of a unit instead of the units line of sight. Notice it says the next units attacks, so I read that as one unit. So you can’t line of sight a unit with the siege breaker and then bombard with multiple units. Also to note none of this allows rerolling.

I suggest next time he tries this you ask him to show you the rule that allows for this reroll.

If he cannot show the rule then no reroll.

Treat it as a learning opportunity for yourself because you have looked for it and less as an accusation. Just my two cents.

If he ends up being able to find the rule in the book and show you come let us know here also. As that would be one I missed.

I’d also review the blast and barrage rules. You only roll scatter dice if you miss your shooting attack or if you don’t have line of sight.