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0CP stratagem Psi-Bolt ammunition.
The enemy must re-roll successfull invul saves against attacks from this unit.

Would fit well with the current design paradigm.

a_typical_hero wrote:
0CP stratagem Psi-Bolt ammunition.
The enemy must re-roll successfull invul saves against attacks from this unit.

Would fit well with the current design paradigm.

Wouldn't a quasi specific AP against invuls be better?

As invul saves are specifically described as saves that never get modified to be worse, I would not like to go that route. Feels too much like breaking a core rule.

a_typical_hero wrote:
As invul saves are specifically described as saves that never get modified to be worse, I would not like to go that route. Feels too much like breaking a core rule.

Core rules get gaked on by GW all the time, especially for special rules cue transports not beeing able to be left except the primaris one etc.

The issue i see with your suggestion is that as soon as that hits a blob of say letters that will get a whole lot more rerolling and is frankly against low invul save targets overly effective, against good invul models underperforming.

10 Grey Knights in rapid fire range would cause 4,44 dice to be rerolled on average. I don't think that is too much.

In %, yes. Re-rolls are hitting weak saves harder than good ones. Same can be said about up to -2AP though.

a_typical_hero wrote:
As invul saves are specifically described as saves that never get modified to be worse, I would not like to go that route. Feels too much like breaking a core rule.

I completely understand this, which is why I'd want only Grey Knights to have it. Much like Tzeentch being the only ones allowed to boost invulnerable saves (which they can already do, so it's not like it's without precedent).
It's also likely this would be implemented by being a modifier to the dice roll, rather than the save itself, which helps.

Imperial Guard can also boost invulnerable saves, and Eldar can lower them. Neither mechanic are unique to begin with lol.

Well the original 3rd ed GK psycannon/incinerator thing it was basically all S6 AP4 and specifically ignored invulnerable save. it murdered demons in droves (except bloodletters who had brass armor of khorne 3+ save ) but as noted in a previous post to counter that they got sustained assault for fighting the GKs.