Slaanesh Keeper of Secrets Command Ability question

[Cosmicsheep]

Ok, having a debate with a mate who plays Slaneesh. Please bear in mind that we are all fairly new to AoS and still getting to grips with all the rules, but the command ability of the KoS is one we can't agree on.

Official wording of the command ability is:

Excess of Violence

If a Keeper of Secrets uses this ability, select a Slaanesh Daemon unit within 12". In your next combat phase, that unit can be selected to pile in and attack twice, instead of once.

Can multiple command points be used to stack this ability. There is no wording that says can only be used once etc.., but it says twice, rather than an extra time. We know you can generally spend multiple command points in a phase, we're pretty sure you can use inspiring prescence etc more than once, but this one is different.

Any help would be appreciated, thanks.

[King Taloren]

Since is does specifically calls out twice it cannot stack. If it said along the lines of attack again after attacking I could see an argument but not it is quite explicit in its wording. It can be used on multiple units but going more than once on a unit is just a waste of Command points because you cannot attack twice twice.

[Carnith]

to expand further on this, the exalted keeper and regular keeper also cannot stack since the Exalted version says you can immediately pile in and attack again for a second time, which would disallow them for being selected again in the phase, though I guess an FAQ about that would need to be expanded upon.

[Damian]

Thanks for the answers, I am part of the same group and we are all having fun with the game and enjoying learning the rules, I just hope the new Slaanesh tome will make the wording a little less ambiguous  🙂