system
Given the following post, respond as if you're commenting on Reddit:
human
[MC/MCU]What is it like in the soul stone?

Is it different in both continuities? Is it ever explained? Do they just not exist?
gpt
In both universes, it’s a pocket dimension that doesn’t contain *every* disembodied soul in the universe/afterlife, but the Gem/Stone can acquire or steal souls individually.

In 616, Soul World creates a bizarre “physical” environment and allows trapped souls to interact with each other (Adam Warlock took a sort of leadership role when he was in there).  Escape is possible, as Warlock manages to get himself and others out in time for “Infinity Gauntlet”.

In the MCU, Soul World is far emptier, but that may be because fewer people have interacted with it.  The only known terrain is a “ground” covered in shallow “water”, and a structure resembling architecture from the home world of Gamora (Soulworld’s only known inhabitant at the time).  The only confirmed souls within the Stone are those sacrificed on Vormir, and they are permanently taken in.  Victims of the Snap/Blip either did not become residents of Soulworld or retained no memory of it upon returning to life, because Blipped beings did not perceive the passage of time between their being erased and returning.