The Garden of Nurgle in 40k

"Guilliman looked over the Garden of Nurgle. He was between two worlds. The warp was a shifting thing, never constant. The garden was a collection of ideas. It had no true form, and through it he could see a million other worlds that underpinned it, the dreams of souls living and dead, and past that, as if glimpsed through banks of glittering sea mist that evaporated before the morning sun, the battlefield of Iax."

-Godblight