Soulworld is the pocket dimension inside of the green Infinity Gem, known the Soul Gem.
Nemesis is possibly the creator of Soulworld.
Points of Interest
There is a tall mountain within Soul World where Warlock has found refuge while he meditated in search of purpose.
Soul World acts as a place of purgatory for souls of the righteous.
Strange Tales #179 (1975)
The pocket dimension of beings captured and drawn into the Soul Gem is a place of peace and tranquility. The captured souls reside here in complete harmony, sharing a dimensional consciousness and well-being. Record shows that there have only been a select few to leave this realm for any length of time, and until recently Adam Warlock, the Magus (Adam Warlock), Gamora, and Pip the Troll are the only beings to ever do so without returning.
During his stay in Soulworld the Magus realized that he was just ghost in this place of peace. He could not interact with any of the other souls, nor could they even detect his presence. Recently while engaged in battle with the being known as Count Abyss, Warlock used the soul of Judge Kray-Tor to drive the evil Despot insane.
*Please note that this profile is only about the pocket dimension within the Soul Gem and not the Soul Gem itself.