Apologies if this has been answered but I couldn’t find it.
I’m new to Sigmar and are am building an StD army. I want to ally Khorne units from the original core set as well as some Tzeench troops I have.
My question is, do I need those armies’ battle tomes to ally them in? Do I need their warscroll battalion info? Or how do I go about it. Lastly, are the warscrolls basically like detachments in 40k?