Naflem

Nothing about abilities stacking in the new rules of one, However I've got a theory now that we could still see that in there under the "warscroll update" section that was listed in the table of contents that nobody is sure what is. It's only a couple pages I think but if they want to maybe handle it on an ability by ability basis (only nurfing the ones that seems really overpowered when stacked) they could just have them listed on that like "Aether Kemist - Aetheric Augmentation - This ability no longer stacks with itself. Skaven Packmaster - Herded Into The Fray - This ability no longer stacks with itself" etc.

Arguably if you have Korghos in the Goretide couldn't you get Aqshy's Bane twice and do two pile in and attacks in your hero phase? I mean, Korghos is still a/the "mighty lord of khorne"

I don't know. Summoning spells exist even if you don't have the scrolls they appear in in your army.

Stonehorn painting for me today..