"The energy I used to travel to this universe was enormous. Do you know any way to reduce the cost?" Mercer asked him.
Every spatial jump consumed far too much energy. If he had to keep absorbing energy from stars throughout the universe like this...
Even Zombie Sentry, with the energy of a million stars, could not sustain that kind of expenditure.
If possible, going back to retrieve the Main Universe's Soul Stone would be better. It was far, far stronger than the Marvel Cinematic Universe's version.
But he was jumping across multiple multiverses, not popping downstairs to buy something at a corner shop. The energy required for two universe-spanning jumps was no small matter.
The golden cocoon of light thought for a while, then said, "Yes. If you're capable of it, you could try constructing a pocket universe.
"Use it as a way station between your universe and this one. Thanks to the unique nature of pocket universes, you could jump into it first, then jump from there to your previous universe."
"Oh? A pocket universe? Tell me more."
The unfamiliar term piqued Mercer's interest.
"A pocket universe is, essentially, a universe of finite size. Universes like the one we're in now are generally infinite.
"Unlike parallel universes, a pocket universe exists between universes. It doesn't overlap with them the way parallel universes do, but occupies the gaps between them.
"However, without a specific method of breaking through space to travel between them, they would never intersect.
"The quality of a pocket universe depends on how powerful its creator is. It could end up as a miniature universe used to store objects, a medium-sized universe that cannot grow but can support inhabitants, or a large universe capable of limitless growth.
"Whether it becomes a universe like those outside, or