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So with the new Chaos Knight release from Forge World it seems that Chaos is finally getting some rules for these and at a modest sum we can give them the "Daemon" rule.
With that said I am pretty sure that if I use "Cursed Earth" (Malefic Psychic power) it will not only boost the Daemon Inv save but also the Ion shield since "Cursed Earth" does not specifically state that it only bolsters the Daemon Inv save. This should also work the same with the "Grimoire of True Names".
Now I think I got this right, but just in case I thought i'll ask before taking it out for a spin.

Yes .

Agreed.

yes, because there is no such thing as a "daemon invul save", just Invul save granted from different sources. If something effects the Invul of a models, it affects all Invuls it has

Thanks guys!

As a counter-warning; this also means that your ion shield save can be reduced or removed via Sanctic Daemonology and similar effects.

Unanimous? Wow...

enjoy it while it lasts

Saw a game recently where someone did theses shenanigans on the chaos knight. 2++ ion opponent wasnt happy

When combined with the dAemon of tzeentch rule (which may or may not be allowed, due to atrocious wording) then that's a 2++ rerolable. Dirty

Captyn_Bob wrote:
When combined with the dAemon of tzeentch rule (which may or may not be allowed, due to atrocious wording) then that's a 2++ rerolable. Dirty

So an Imperial Knight dedicated to Tzeentch counts as a Tzeentch daemon thus can reroll saving throws of 1?

Yaa, it would appear so. But the wording on that answer from FW was pretty darn confusing. Nobody really understands it I think lol. We're all just rolling with: it means their are daemons of in addition to the daemon knight rules. They cost enough for that to be a possibility.