A deep, deep dive into what the lore says about multiversal nature of the Warp, part 1: Recent lore (with many, many quotes)
TLDR: This is a long one (because there is so much source material to survey), covering tonnes of quotes from the lore which showcase that the notion of a multiverse is present in each of the 40k and Age of Sigmar lores, but that both settings are stated to be part of the same multiverse connected to the same Warp, and with some of the same Chaos gods and daemons appearing in and/or affecting each setting. I have in recent months been charting the links in the lore between the Warhammer settings, and how they have evolved over time. These posts have been mostly (though not wholly) focused on the period before Age of Sigmar was launched, and have looked at various topics such as the legacy of the Old Ones/Slann, specific crossovers related to Chaos, and back when the Warhammer World was a planet within the 40k galaxy. This is the first of three posts focusing specifically on the notion of a Warhammer multiverse with the Warp as the central connecting element, and it will start by lookin...